Datasheet

Monitor ROM (MON)
Functional Description
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3 Technical Data
Freescale Semiconductor Monitor ROM (MON) 171
10.4.5 Break Signal
A start bit followed by nine low bits is a break signal. (See Figure 10-6.)
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 10-6. Break Transaction
10.4.6 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)
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