Unknown Year, 5.2L MC68HC16Z2 Initialization Code Overview
From JTEC_PCM
Revision as of 09:25, 2 March 2012 by Boostinallovryou (Talk | contribs) (Added more initialization)
- 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
