MC68HC908JK8CP Freescale Semiconductor, MC68HC908JK8CP Datasheet - Page 90

• Manufacturer Part Number: MC68HC908JK8CP
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC908JK8CP

• Cpu Family: HC08
• Device Core Size: 8b
• Frequency (max): 8MHz
• Interface Type: SCI
• Program Memory Type: Flash
• Program Memory Size: 8KB
• Total Internal Ram Size: 256Byte
• # I/os (max): 15
• Number Of Timers - General Purpose: 4
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 13-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Through Hole
• Pin Count: 20
• Package Type: PDIP
• Lead Free Status / Rohs Status: Not Compliant

Monitor ROM (MON)
The data transmit and receive rate can be anywhere from 4800 baud to 28.8k-baud. Transmit and receive
baud rates must be identical.
7.3.4 Echoing
As shown in
for error checking.
Any result of a command appears after the echo of the last byte of the command.
7.3.5 Break Signal
A start bit followed by nine low bits is a break signal. (See Figure 7-6.) When the monitor receives a break
signal, it drives the PTB0 pin high for the duration of two bits before echoing the break signal.
7.3.6 Commands
The monitor ROM uses the following commands:
90
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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
MC68HC908JL8/JK8 • MC68HC08JL8/JK8 • MC68HC908KL8 Data Sheet, Rev. 3.1
7-5, the monitor ROM immediately echoes each received byte back to the PTB0 pin
0
1
READ
2
MISSING STOP BIT
3
4
READ
Figure 7-6. Break Transaction
Figure 7-5. Read Transaction
5
6
ADDR. HIGH
7
ADDR. HIGH ADDR. LOW
TWO-STOP-BIT DELAY BEFORE ZERO ECHO
0
1
2
ADDR. LOW
3
4
5
6
RESULT
DATA
Freescale Semiconductor
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