mc68hc908bd48 Freescale Semiconductor, Inc, mc68hc908bd48 Datasheet - Page 120

• Manufacturer Part Number: mc68hc908bd48
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

Monitor ROM (MON)
9.4.3 Echoing
9.4.4 Break Signal
Data Sheet
120
The data transmit and receive rate can be anywhere from 4800 baud to
28.8 kbaud. Transmit and receive baud rates must be identical.
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.
SENT TO
MONITOR
ECHO
0
1
READ
Figure
2
Monitor ROM (MON)
3
MISSING STOP BIT
Figure 9-5. Break Transaction
4
Figure 9-4. Read Transaction
9-4, the monitor ROM immediately echoes each
READ
5
6
ADDR. HIGH
7
ADDR. HIGH ADDR. LOW ADDR. LOW
TWO-STOP-BIT DELAY BEFORE ZERO ECHO
0
MC68HC908BD48
1
Freescale Semiconductor
2
3
4
Figure
5
—
RESULT
6
DATA
Rev. 2.1
9-5).
7