MC68HC908AS32A Datasheet, PDF (250/280 Pages) Freescale Semiconductor, Inc – Microcontrollers

Development Support
POR RESET
CONDITIONS
FROM Table 18-1
DEBUGGING
AND FLASH
PROGRAMMING
(IF FLASH
IS ENABLED)
NO
IRQ = V_TST?
NORMAL
USER MODE
YES
PTA0 = 1,
NO
PTC0 = 1, AND
PTC1 = 0?
YES
NORMAL
MONITOR MODE
INVALID
USER MODE
HOST SENDS
8 SECURITY BYTES
IS RESET
POR?
NO
YES
YES
ARE ALL
SECURITY BYTES
NO
CORRECT?
ENABLE ROM
DISABLE ROM
MONITOR MODE ENTRY
EXECUTE
MONITOR CODE
YES
DOES RESET
NO
OCCUR?
Figure 18-5. Simplified Monitor Mode Entry Flowchart
MC68HC908AS32A Data Sheet, Rev. 2.0
250
Freescale Semiconductor