MC68HC708AS48 FREESCALE [Freescale Semiconductor, Inc], MC68HC708AS48 Datasheet - Page 166

• Manufacturer Part Number: MC68HC708AS48
• Description: Advance Information
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Monitor ROM (MON)
12.4.3 Echoing
12.4.4 Break Signal
Advance Information
166
SENT TO
MONITOR
ECHO
0
READ
1
2
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.
3
MISSING STOP BIT
READ
4
Figure 12-5. Break Transaction
Figure 12-4. Read Transaction
5
Figure
6
ADDR. HIGH
Monitor ROM (MON)
7
12-4, the monitor ROM immediately echoes each
ADDR. HIGH
TWO-STOP-BIT DELAY BEFORE ZERO ECHO
0
ADDR. LOW
1
2
3
ADDR. LOW
MC68HC708AS48
4
5
6
RESULT
DATA
Figure
7
MOTOROLA
—
Rev. 4.0
12-5.)