MC68HC(7)08KH12
—
Rev. 1.1
Advance Information
Freescale Semiconductor
155
10.4.4 Break Signal
A start bit followed by nine low bits is a break signal.
(See Figure 10-5.)
When the monitor receives a break signal, it drives the PTA0 pin high for
the duration of two bits before echoing the break signal.
Figure 10-5. Break Transaction
10.4.5 Commands
The monitor ROM uses the following commands:
•
READ (read memory)
•
WRITE (write memory)
•
IREAD (indexed read)
•
IWRITE (indexed write)
•
READSP (read stack pointer)
•
RUN (run user program)
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
MISSING STOP BIT
TWO-STOP-BIT DELAY BEFORE ZERO ECHO
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