MC68HC908JK1 Datasheet, PDF (109/210 Pages) Motorola, Inc – MC68HC908JK1

Monitor ROM (MON)
Functional Description
9.4.5 Break Signal
A start bit followed by nine low bits is a break signal. (See Figure 9-6.)
When the monitor receives a break signal, it drives the PTB0 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 9-6. Break Transaction
9.4.6 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)
MC68H(R)C908JL3 — Rev. 1.0
MOTOROLA
Monitor ROM (MON)
Technical Data
109