
Development Support
MC68HC908GT16 MC68HC908GT8 MC68HC08GT16 Data Sheet, Rev. 4.0
244
Freescale Semiconductor
Figure 19-9. Simplified Monitor Mode Entry Flowchart
MONITOR MODE ENTRY
POR RESET
PTA0 = 1, PTC0 = 1,
PTC1 = 0, AND
PTC3 = 1?
IRQ = VTST?
PTA0 = 1,
RESET
BLANK?
YES
NO
YES
NO
FORCED
MONITOR MODE
NORMAL
USER MODE
NORMAL
MONITOR MODE
FACTORY
USE ONLY
NO
SEND 8 BYTES
SECURITY
IS RESET
POR?
YES
NO
ARE ALL
SECURITY BYTES
CORRECT?
NO
YES
ENABLE FLASH
DISABLE FLASH
EXECUTE
MONITOR CODE
DOES RESET
OCCUR?
CONDITIONS
DEBUGGING
AND FLASH
PROGRAMMING
(IF FLASH
IS ENABLED)