mc68hc908jb8 Freescale Semiconductor, Inc, mc68hc908jb8 Datasheet - Page 171

• Manufacturer Part Number: mc68hc908jb8
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

10.4.5 Break Signal
10.4.6 Commands
MC68HC908JB8•MC68HC08JB8•MC68HC08JT8 — Rev. 2.3
Freescale Semiconductor
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.
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
MISSING STOP BIT
Monitor ROM (MON)
3
Figure 10-6. Break Transaction
4
5
6
7
TWO-STOP-BIT DELAY BEFORE ZERO ECHO
0
1
2
Functional Description
3
Monitor ROM (MON)
4
Technical Data
5
6
7
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