Datasheet

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MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 Data Sheet, Rev. 2.1
182 Freescale Semiconductor
Figure 16-15. Monitor Mode Entry Timing
After receiving the eight security bytes from the host, the MCU transmits a break character signalling that
it is ready to receive a command.
NOTE
The MCU does not transmit a break character until after the host sends the
eight security bytes.
BYTE 1
BYTE 1 ECHO
BYTE 2
BYTE 2 ECHO
BYTE 8
BYTE 8 ECHO
COMMAND
COMMAND ECHO
PTA0
PTA1
IRST
V
DD
4096 + 64 CGMXCLK CYCLES
24 CGMXCLK CYCLES
256 CGMXCLK CYCLES (ONE BIT TIME)
1
4
1
1
2
1
BREAK
Notes: 1 = Echo delay (2 bit times)
2 = Data return delay (2 bit times)
4 = Wait 1 bit time before sending next byte.
4
FROM HOST
FROM MCU