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Changes
→Original Firmware: Document initial GPIO states
IDA Pro uses CPU type ST7->ST72324J6 during loading, and can load the Intel Hex file produced by the programmer directly for analysis.
===== Option Bytes =====
Option bytes are set to 0xE7F7
[[File:OptionBytes.png|none|thumb|ST7 Original Firmware Option Byte Info]]
=== GPIO Initialization ===
* PADDR = 0xF0, PAOR = 0x38 or 0x30 depending on address 0xF3
** PA7: Open Drain Output
** PA6: Open Drain Output
** PA5: Push Pull Output
** PA4: Push Pull Output
** PA3: Depends on address 0xF3
* PBDDR = 0x0F, PBOR=0x1F
** PB4 - Pullup interrupt input
** PB3 - Push Pull Output
** PB2 - Push Pull Output
** PB1 - Push Pull Output
** PB0 - Push Pull Output
* PCDDR = 0x03, PCOR=0x0B
** PC7 - floating input
** PC6 - floating input
** PC5 - floating input
** PC4 - floating input
** PC3 - pullup input
** PC2 - floating input
** PC1 - push pull output
** PC0 - push pull output
* PDDDR = 0x20, PDOR=default to 0x0
** PD5 - open drain output
** PD4 - floating input
** PD3 - floating input
** PD2 - floating input
** PD1 - floating input
** PD0 - floating input
* PFDDR = 0x20 or 0x80 depending on address 0xF3, PFOR=0x10 or 0x80 depending on address 0xF3
** PF7 - depends on 0xF3
** PF6 - floating input
** PF5 - depends on 0xF3
** PF4 - depends on 0xF3
** PF2 - floating input
** PF1 - floating input
** PF0 - floating input
==Modifications==