Difference between revisions of "Unknown Year, 5.2L MC68HC16Z2 Initialization Code Overview"

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(More initialization)
(Even more initialization)
 
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* 0x200E6 Wrote 0x0 to CSOR6
 
* 0x200E6 Wrote 0x0 to CSOR6
 
:Chip select 6 disabled
 
:Chip select 6 disabled
 +
 +
 +
* 0x200F2 Wrote 0xFFF8 to CSBAR7
 +
:Set Chip select 7 base address to:
 +
:0xFF800 size 2K
 +
 +
* 0x200F6 Wrote 0x2801 to CSOR7
 +
:Lower byte only
 +
:Read only
 +
:No wait
 +
:CPU space
 +
:Any interrupt level
 +
:Autovector enabled
 +
 +
 +
* 0x20102 Wrote 0x0 to CSBAR8
 +
* 0x20106 Wrote 0x0 to CSOR8
 +
:Chip select 8 disabled
 +
 +
 +
* 0x20112 Wrote 0x0 to CSBAR9
 +
* 0x20116 Wrote 0x0 to CSOR9
 +
:Chip select 9 disabled
 +
 +
 +
* 0x20122 Wrote 0x0005 to CSBAR10
 +
:Set Chip select 10 base address to:
 +
:0x0 size 256K
 +
 +
* 0x20126 Wrote 0x6830 to CSOR10
 +
:Upper and lower bytes
 +
:Read only
 +
:Address strobe
 +
:No wait
 +
:Supervisor / User space
 +
:Any interrupt level
 +
:External interrupt vector
 +
 +
 +
* 0x20130 Wrote 0x0 to PFPAR
 +
:Set all port F pins to I/O pins
 +
 +
 +
* 0x20138 Wrote 0x0 to ADCMCR
 +
:Set ADC to normal operation from low power mode
 +
:Ignore IFREEZE signal
 +
:Set to unrestricted access
 +
 +
* 0x20140 wrote 0xE3 to ADCTL0
 +
:Set to 10 bit resolution
 +
:Set to 16 A/D clock periods
 +
:Set divisor to 8 (Max system clock is 16MHz, Min system clock is 4MHz)
 +
 +
 +
* 0x20144 Loaded Port C Data
 +
* 0x20148 ANDed Port C Data with 0x8F
 +
* 0x2014A ORed Port C Data with 0x40
 +
* 0x2014C Wrote new data out to Port C
 +
 +
 +
* 0x20154 Wrote 0x45 to TCTL1/TCTL2
 +
:Disconnected output logic from Timers 5,4,3, and 2
 +
:Set Edge pins 4,2, and 1 to capture on the rising edge
 +
 +
 +
* 0x2015C Wrote 0x0161 to CFORC/PWMC
 +
:Normal PWMA operation
 +
:Value of F1A is driven out on PWMB pin
 +
:PWM prescalar = 64 system clock divide by factor
 +
:PWMA period is 256 PWMCNT increments long
 +
:PWMB period is 256 PWMCNT increments long
 +
:PWM is 1.02KHz
 +
:Force logic level 0 on PWMA
 +
:Force logic level 1 on PWMB
 +
 +
 +
* 0x20164 Wrote 0x3838 to DDRGP/PORTGP
 +
:Set pins 3,4, and 5 as output pins
 +
:Wrote all output ins high (3,4, and 5)
 +
 +
 +
* 0x20168 wrote 0x0 to SPCR3
 +
:Disabled QSPI loop mode feedback path
 +
:Disabled interrupts on HALTA & MODF
 +
:Cleared HALT
 +
 +
*0x20170 Wrote 0x8108 to SPCR0
 +
:QSPI is master and can initiate transmission
 +
:Outputs have normal MOS drivers
 +
:Set 16 bits per transfer
 +
:Set inactive state of SCK to be logic level 0
 +
:Data is changed on leading edge of SCK and data is captured on following
 +
:Set the baud rate generator
 +
 +
* 0x20176 Wrote 0x7C to PORTQS
 +
* 0x2017C Wrote 0x1E to DDRQS
 +
:Set PCS0 & PCS1 to be outputs
 +
:Set serial clock as output
 +
:Set master out slave in output, master in slave out input
 +
 +
* 0x20182 Wrote 0x1F to PQSPAR
 +
:Set PCS1, PCS0, MOSI, and MISO as QSPI pins
 +
 +
* 0x2018A Wrote 0x40 to SCCR0
 +
:Set SCI baud rate
 +
 +
* 0x20192 Wrote 0x0C to SCCR1
 +
:Tx & Rx Enabled
 +
 +
* 0x2019A Wrote 0x04 to PITR
 +
:Set periodic interrupt timer
 +
 +
* 0x201A2 Wrote 0x0338 to PICR
 +
:Set periodic interrupt to interrupt request level 3
 +
:Set periodic interrupt to vector 0x38
 +
 +
 +
* 0x201AA Wrote 0x8c to GPTMCR
 +
:Set general purpose timer interrupt priority to 0xC
 +
 +
* 0x201CC Wrote 0x5400 to PACTL/PACNT
 +
:Enabled pulse accumulator
 +
:Set external event counting
 +
:PAI rising edge increments the counter
 +
:Zeroed out the pulse accumulator count
 +
 +
* 0x201D4 Wrote 0x0440 to ICR
 +
:General purpose timer interrupt source 0 has the highest priority
 +
:General purpose timer interrupts have 0x100 priority
 +
:General purpose timer interrupt vectors upper nibble is 0x4
 +
 +
 +
* 0x201DC - 0x201E6
 +
:Clear Receive, Transmit, and Command RAM

Latest revision as of 14:01, 2 March 2012

  • Reset Vector = 0x0
First byte of reset vector = PK (Program Counter Extension)
Second byte of reset vector = SK (Stack Pointer Extension)
Third byte of reset vector = ZK (Index Z Extension)
PK = 0x01
SK = 0xFF
ZK = 0xFF
Initial PC = 0x0 | PK = (0x10000)


  • 0x10000 Jump to 0x20000
  • 0x20002 Wrote 0xFF to SK
  • 0x20004 Wrote 0xFF to ZK
  • 0x20006 Wrote 0xF8FE to SP
  • 0x2000A Wrote 0xF800 to Z
  • 0x20010 Wrote 0x00 to EK, XK, & YK
  • 0x2001E Write 0xB4 to SYPCR
Enabled Watchdog
Turned off scaling
Set timeout to 2 to the 15th


  • 0x20024 Wrote 0x55 to SWSR
  • 0x2002A Wrote 0xAA to SWSR
Writing 0x55 then 0xAA to SWSR pets the watchdog


  • 0x20032 Wrote 0xFF to RAMBAH
  • 0x2003A Wrote 0x8000 to RAMBAL
This set RAM to start at 0xF8000
  • 0x2003E cleared RAMMCR
Took RAM out of low power mode and enabled it.
Allowed writes to RAM from IMB


  • 0x2004C ORed 0x8100 to SIMCR
Turned off external clock
Set external bus master to have direct access to IMB


  • 0x20052 Wrote 0x30 to PEPAR
Port E Pin Assignment
Set PEPA5 as Address Strobe
Set PEPA4 as Data Strobe
  • 0x20056 Wrote 0x30 to DDRE
Port E Pin Direction
Set DDE5 & DDE4 as outputs


  • 0x20062 Wrote 0x3FFF to CSPAR0
  • 0x20066 wrote 0x0300 to CSPAR1
Set CS10 (ADR23)


  • 0x20072 Wrote 0xFE02 to CSBARBT
Set boot rom chip select base address to:
0xFE0000 size 16K
  • 0x20076 Wrote 0x6BB0 to CSORBT
Set Async chip select assertion
Set Upper and lower byte chip select
Set Chip select to assert only for a read
Set Chip select to assert synchronized with data strobe
Set DSACK fast termination
Set Chip select address space to Supervisor/User
Enabled all interrupt levels & external interrupt vector


  • 0x20082 Wrote 0x0500 to CSBAR0
Set Chip select 0 base address to:
0x050000 size 2K
  • 0x20084 Wrote 0x6870 to CSOR0
One wait state


  • 0x20092 Wrote 0x0005 to CSBAR1
Set Chip select 1 base address to:
0x0 size 256K
  • 0x20094 Wrote 0x5070 to CSOR1
Upper byte only
Write only
Address strobe
1 Wait cycle
Supervisor/User space


  • 0x200A2 Wrote 0x0005 to CSBAR2
Set Chip select 2 base address to:
0x0 size 256K
  • 0x200A6 Wrote 0x3070 to CSOR2
Lower byte only
Write only
Address strobe
1 Wait cycle
Supervisor/User space


  • 0x200B2 Wrote 0x0 to CSBAR3
  • 0x200B6 Wrote 0x0 to CSOR3
Chip select 3 disabled


  • 0x200C2 Wrote 0x0 to CSBAR4
  • 0x200C6 Wrote 0x0 to CSOR4
Chip select 4 disabled


  • 0x200D2 Wrote 0x0400 to CSBAR5
Set Chip select 5 base address to:
0x40000 size 2K
  • 0x200D6 Wrote 0x3070 to CSOR5
Lower byte only
Write only
Address sstrobe
1 Wait cycle
Supervisor/User space


  • 0x200E2 Wrote 0x0 to CSBAR6
  • 0x200E6 Wrote 0x0 to CSOR6
Chip select 6 disabled


  • 0x200F2 Wrote 0xFFF8 to CSBAR7
Set Chip select 7 base address to:
0xFF800 size 2K
  • 0x200F6 Wrote 0x2801 to CSOR7
Lower byte only
Read only
No wait
CPU space
Any interrupt level
Autovector enabled


  • 0x20102 Wrote 0x0 to CSBAR8
  • 0x20106 Wrote 0x0 to CSOR8
Chip select 8 disabled


  • 0x20112 Wrote 0x0 to CSBAR9
  • 0x20116 Wrote 0x0 to CSOR9
Chip select 9 disabled


  • 0x20122 Wrote 0x0005 to CSBAR10
Set Chip select 10 base address to:
0x0 size 256K
  • 0x20126 Wrote 0x6830 to CSOR10
Upper and lower bytes
Read only
Address strobe
No wait
Supervisor / User space
Any interrupt level
External interrupt vector


  • 0x20130 Wrote 0x0 to PFPAR
Set all port F pins to I/O pins


  • 0x20138 Wrote 0x0 to ADCMCR
Set ADC to normal operation from low power mode
Ignore IFREEZE signal
Set to unrestricted access
  • 0x20140 wrote 0xE3 to ADCTL0
Set to 10 bit resolution
Set to 16 A/D clock periods
Set divisor to 8 (Max system clock is 16MHz, Min system clock is 4MHz)


  • 0x20144 Loaded Port C Data
  • 0x20148 ANDed Port C Data with 0x8F
  • 0x2014A ORed Port C Data with 0x40
  • 0x2014C Wrote new data out to Port C


  • 0x20154 Wrote 0x45 to TCTL1/TCTL2
Disconnected output logic from Timers 5,4,3, and 2
Set Edge pins 4,2, and 1 to capture on the rising edge


  • 0x2015C Wrote 0x0161 to CFORC/PWMC
Normal PWMA operation
Value of F1A is driven out on PWMB pin
PWM prescalar = 64 system clock divide by factor
PWMA period is 256 PWMCNT increments long
PWMB period is 256 PWMCNT increments long
PWM is 1.02KHz
Force logic level 0 on PWMA
Force logic level 1 on PWMB


  • 0x20164 Wrote 0x3838 to DDRGP/PORTGP
Set pins 3,4, and 5 as output pins
Wrote all output ins high (3,4, and 5)


  • 0x20168 wrote 0x0 to SPCR3
Disabled QSPI loop mode feedback path
Disabled interrupts on HALTA & MODF
Cleared HALT
  • 0x20170 Wrote 0x8108 to SPCR0
QSPI is master and can initiate transmission
Outputs have normal MOS drivers
Set 16 bits per transfer
Set inactive state of SCK to be logic level 0
Data is changed on leading edge of SCK and data is captured on following
Set the baud rate generator
  • 0x20176 Wrote 0x7C to PORTQS
  • 0x2017C Wrote 0x1E to DDRQS
Set PCS0 & PCS1 to be outputs
Set serial clock as output
Set master out slave in output, master in slave out input
  • 0x20182 Wrote 0x1F to PQSPAR
Set PCS1, PCS0, MOSI, and MISO as QSPI pins
  • 0x2018A Wrote 0x40 to SCCR0
Set SCI baud rate
  • 0x20192 Wrote 0x0C to SCCR1
Tx & Rx Enabled
  • 0x2019A Wrote 0x04 to PITR
Set periodic interrupt timer
  • 0x201A2 Wrote 0x0338 to PICR
Set periodic interrupt to interrupt request level 3
Set periodic interrupt to vector 0x38


  • 0x201AA Wrote 0x8c to GPTMCR
Set general purpose timer interrupt priority to 0xC
  • 0x201CC Wrote 0x5400 to PACTL/PACNT
Enabled pulse accumulator
Set external event counting
PAI rising edge increments the counter
Zeroed out the pulse accumulator count
  • 0x201D4 Wrote 0x0440 to ICR
General purpose timer interrupt source 0 has the highest priority
General purpose timer interrupts have 0x100 priority
General purpose timer interrupt vectors upper nibble is 0x4


  • 0x201DC - 0x201E6
Clear Receive, Transmit, and Command RAM
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