MC68HC08AZ60A Datasheet, PDF (182/480 Pages) Motorola, Inc – Microcontrollers

Monitor ROM (MON)
12.4.3 Echoing
The monitor ROM immediately echoes each received byte back to the
PTA0 pin for error checking, as shown in Figure 12-4.
SENT TO
MONITOR
READ
READ ADDR. HIGH ADDR. HIGH ADDR. LOW ADDR. LOW
DATA
ECHO
Figure 12-4. Read Transaction
RESULT
Any result of a command appears after the echo of the last byte of the
command.
12.4.4 Break Signal
A break signal is a start bit followed by nine low bits. This is shown in
Figure 12-4. 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 12-5. Break Transaction
Advance Information
182
Monitor ROM (MON)
MC68HC08AZ60A — Rev 0.0
MOTOROLA