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| MC68HC908GR16 Datasheet, PDF (243/276 Pages) Motorola, Inc – Microcontrollers | |||
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⢠If $FFFE and $FFFF contain $FF (erased state):
â The external clock is 32.768 kHz
â IRQ = VSS
The last two conditions are the forced monitor mode.
POR RESET
Monitor ROM (MON)
CONDITIONS
FROM Table 19-1
DEBUGGING
AND FLASH
PROGRAMMING
(IF FLASH
IS ENABLED)
NO
IRQ = VTST?
YES
PTA0 = 1,
PTA1 = 0, RESET
BLANK?
YES
FORCED
MONITOR MODE
NO
NORMAL
USER MODE
SEND 8 BYTES
SECURITY
PTA0 = 1, PTA1 = 0, NO
PTB0 = 1, AND
PTB1 = 0?
YES
NORMAL
MONITOR MODE
FACTORY
USE ONLY
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
MC68HC908GR16 Data Sheet, Rev. 5.0
Freescale Semiconductor
243
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