MC68HC08GZ32 Datasheet, PDF (283/320 Pages) Freescale Semiconductor, Inc – Microcontrollers

20.3.1 Functional Description
Figure 20-9 shows a simplified diagram of the monitor mode.
POR RESET
Monitor Module (MON)
CONDITIONS
FROM Table 20-1
NO
IRQ = V_TST?
YES
PTA0 = 1, PTA1 = 0, _NO
PTB0 = 1, AND
PTB1 = 0?
YES
NORMAL
MONITOR MODE
USER 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
DEBUGGING
EXECUTE
MONITOR CODE
YES
DOES RESET
NO
OCCUR?
Figure 20-9. Simplified Monitor Mode Operation Flowchart
MC68HC08GZ32 Data Sheet, Rev. 3
Freescale Semiconductor
283