MC68HC908LB8_05 Datasheet, PDF (210/234 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers

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POR RESET
CONDITIONS
FROM Table 19-1
DEBUGGING
AND FLASH
PROGRAMMING
(IF FLASH
IS ENABLED)
NO
IRQ = V_TST?
YES
PTA0 = 1,
RESET VECTOR
BLANK?
YES
FORCED
MONITOR MODE
NO
NORMAL
USER MODE
HOST SENDS
8 SECURITY BYTES
PTA1 = 1,
PTA4 = 0, AND
NO
PTA0 = 1?
YES
NORMAL
MONITOR MODE
INVALID
USER MODE
IS RESET
POR?
NO
YES
YES
ARE ALL
SECURITY BYTES
NO
CORRECT?
ENABLE FLASH
DISABLE FLASH
MONITOR MODE ENTRY
EXECUTE
MONITOR CODE
YES
DOES RESET
NO
OCCUR?
Figure 19-9. Simplified Monitor Mode Entry Flowchart
MC68HC908LB8 Data Sheet, Rev. 1
210
Freescale Semiconductor