Unknown Year, 5.2L MC68HC16Z2 Initialization Code Overview
From JTEC_PCM
Revision as of 10:03, 2 March 2012 by Boostinallovryou (Talk | contribs)
- 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
