mc68hc908mr24 Freescale Semiconductor, Inc, mc68hc908mr24 Datasheet - Page 196

• Manufacturer Part Number: mc68hc908mr24
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Monitor ROM (MON)
10.4.3 Echoing
10.4.4 Break Signal
10.4.5 Commands
Advance Information
196
As shown in
received byte back to the PTA0 pin for error checking.
Any result of a command appears after the echo of the last byte of the
command.
A start bit followed by nine low bits is a break signal. See
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 these commands:
SENT TO
MONITOR
•
•
•
•
•
•
ECHO
READ, read memory
WRITE, write memory
IREAD, indexed read
IWRITE, indexed write
READSP, read stack pointer
RUN, run user program
0
1
READ
Figure
2
Monitor ROM (MON)
3
MISSING STOP BIT
Figure 10-5. Break Transaction
Figure 10-4. Read Transaction
4
READ
10-4, the monitor ROM immediately echoes each
5
6
ADDR. HIGH
7
ADDR. HIGH ADDR. LOW
2--STOP-BIT DELAY BEFORE ZERO ECHO
0
MC68HC908MR24
1
Freescale Semiconductor
2
ADDR. LOW
3
4
Figure
5
—
6
RESULT
DATA
Rev. 4.1
10-5.
7