MC68HC08AZ32A Datasheet, PDF (160/456 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Monitor ROM (MON)
11.4.3 Echoing
The monitor ROM immediately echoes each received byte back to the
PTA0 pin for error checking, as shown in Figure 11-4.
SENT TO
MONITOR
READ
READ ADDR. HIGH ADDR. HIGH ADDR. LOW ADDR. LOW
DATA
ECHO
Figure 11-4. Read Transaction
RESULT
Any result of a command appears after the echo of the last byte of the
command.
11.4.4 Break Signal
A break signal is a start bit followed by nine low bits. This is shown in
Figure 11-4. When the monitor receives a break signal, it drives the
PTA0 pin high for the duration of two bits before echoing the break
signal.
MISSING STOP BIT
TWO-STOP-BIT DELAY BEFORE ZERO ECHO
01234567
01234567
Figure 11-5. Break Transaction
Technical Data
160
MC68HC08AZ32A — Rev 1.0
Monitor ROM (MON)
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