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| MC68HC908EY16 Datasheet, PDF (231/278 Pages) Motorola, Inc – Microcontrollers | |||
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POR RESET
Monitor Module (MON)
CONDITIONS
FROM Table 19-1
DEBUGGING
AND FLASH
PROGRAMMING
(IF FLASH
IS ENABLED)
NO
IRQ = VTST?
YES
PTA0 = 1,
PTA1 = 0, RESET
VECTOR BLANK?
YES
FORCED
MONITOR MODE
NO
NORMAL
USER MODE
HOST SENDS
8 SECURITY BYTES
PTA0 = 1, PTA1 = 0, NO
PTB4 = 1, AND
PTB3 = 0?
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 19-8. Simplified Monitor Mode Entry Flowchart
MC68HC908EY16 ⢠MC68HC908EY8 Data Sheet, Rev. 10
Freescale Semiconductor
231
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