mc68hc908gp32 Freescale Semiconductor, Inc, mc68hc908gp32 Datasheet - Page 224

• Manufacturer Part Number: mc68hc908gp32
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Development Support
Table 18-1
must be entered after a power-on reset (POR) and will allow communication at 9600 baud provided one
of the following sets of conditions is met:
Enter monitor mode with the pin configurations shown in
edge of reset latches monitor mode. Once monitor mode is latched, the levels on the port pins except
PTA0 can change.
Once out of reset, the MCU waits for the host to send eight security bytes (see
security bytes, the MCU sends a break signal (10 consecutive 0s) to the host, indicating that it is ready to
receive a command.
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1. If $FFFE and $FFFF does not contain $FF (programmed state):
2. If $FFFE and $FFFF contain $FF (erased state):
3. If $FFFE and $FFFF contain $FF (erased state):
–
–
–
–
–
The external clock is 4.9152 MHz with PTC3 low or 9.8304 MHz with PTC3 high
IRQ = V
The external clock is 9.8304 MHz
IRQ = V
IRQ = V
shows the pin conditions for entering monitor mode. As specified in the table, monitor mode
TST
DD
SS
(PLL is selected using a 32.768 kHz crystal)
(this can be implemented through the internal IRQ pullup)
MC68HC908GP32 Data Sheet, Rev. 10
Table 18-1
with a power-on-reset. The rising
18.3.2
Freescale Semiconductor
Security). After the