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| MC68HC908GR8A_07 Datasheet, PDF (222/260 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Development Support
POR RESET
CONDITIONS
FROM Table 18-1
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
PTB0 = 1, AND
PTB1 = 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 18-9. Simplified Monitor Mode Entry Flowchart
MC68HC908GR8A ⢠MC68HC908GR4A Data Sheet, Rev. 5
222
Freescale Semiconductor
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