mc68hc908mr32 Freescale Semiconductor, Inc, mc68hc908mr32 Datasheet - Page 260

• Manufacturer Part Number: mc68hc908mr32
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

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18.3.1.5 Echoing
As shown in
pin for error checking.
Any result of a command appears after the echo of the last byte of the command.
18.3.1.6 Break Signal
A start bit followed by nine low bits is a break signal. See
signal, it drives the PTA0 pin high for the duration of two bits before echoing the break signal.
18.3.1.7 Commands
The monitor ROM uses these commands (see
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•
•
•
•
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READ, read memory
WRITE, write memory
IREAD, indexed read
IWRITE, indexed write
READSP, read stack pointer
RUN, run user program
Figure
SENT TO
MONITOR
ECHO
18-11, the monitor ROM immediately echoes each received byte back to the PTA0
0
1
READ
MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1
2
3
MISSING STOP BIT
Figure 18-12. Break Transaction
4
READ
Figure 18-11. Read Transaction
5
6
ADDR. HIGH
7
Table 18-3–Table
ADDR. HIGH ADDR. LOW
Figure
2--STOP-BIT DELAY BEFORE ZERO ECHO
0
18-12. When the monitor receives a break
1
18-8):
2
ADDR. LOW
3
4
5
6
RESULT
DATA
Freescale Semiconductor
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