Справочник Пользователя для Motorola MC68HC908MR16
Monitor ROM (MON)
Functional Description
MC68HC908MR16/MC68HC908MR32 — Rev. 4.0
Advance Information
MOTOROLA
Monitor ROM (MON)
191
10.4.2 Data Format
Communication with the monitor ROM is in standard non-return-to-zero
(NRZ) mark/space data format. (See
(NRZ) mark/space data format. (See
and
.)
Figure 10-2. Monitor Data Format
Figure 10-3. Sample Monitor Waveforms
The data transmit and receive rate can be anywhere from 4800 baud to
28.8 Kbaud. Transmit and receive baud rates must be identical.
28.8 Kbaud. Transmit and receive baud rates must be identical.
10.4.3 Echoing
, the monitor ROM immediately echoes each
received byte back to the PTA0 pin for error checking.
Figure 10-4. Read Transaction
Any result of a command appears after the echo of the last byte of the
command.
command.
BIT 5
START
BIT
BIT 0
BIT 1
NEXT
STOP
BIT
START
BIT
BIT 2
BIT 3
BIT 4
BIT 6
BIT 7
BIT 5
START
BIT
BIT 0
BIT 1
NEXT
STOP
BIT
START
BIT
BIT 2
BIT 3
BIT 4
BIT 6
BIT 7
START
BIT
BIT 0
BIT 1
NEXT
STOP
BIT
START
BIT
BIT 2
$A5
BREAK
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
ADDR. HIGH
READ
READ
ADDR. HIGH ADDR. LOW ADDR. LOW
DATA
ECHO
SENT TO
MONITOR
RESULT