MC68HC08JK1 Datasheet, PDF (101/198 Pages) Motorola, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Monitor ROM (MON)
Functional Description
SENT TO
MONITOR
ECHO
READ
READ ADDR. HIGH ADDR. HIGH ADDR. LOW ADDR. LOW DATA
Figure 9-4. Read Transaction
RESULT
Any result of a command appears after the echo of the last byte of the
command.
9.4.5 Break Signal
A start bit followed by nine low bits is a break signal. (See Figure 9-5.)
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 9-5. 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)C08JL3 — Rev. 4
MOTOROLA
Monitor ROM (MON)
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Technical Data
101