MC68HC908LJ12CPB FREESCALE [Freescale Semiconductor, Inc], MC68HC908LJ12CPB Datasheet - Page 163

• Manufacturer Part Number: MC68HC908LJ12CPB
• Description: 8-bit microcontroller units
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Monitor ROM (MON)
10.4.5 Commands
Technical Data
164
NOTE:
Table 10-3
baud rate of 9600 BPS. Other standard baud rates can be accomplished
using proportionally higher or lower frequency generators. If using a
crystal as the clock source, be aware of the upper frequency limit that the
internal clock module can handle. See
Specifications
The monitor ROM firmware uses these commands:
The monitor ROM firmware echoes each received byte back to the PTA0
pin for error checking. An 11-bit delay at the end of each command
allows the host to send a break character to cancel the command. A
delay of two bit times occurs before each echo and before READ,
IREAD, or READSP data is returned. The data returned by a read
command appears after the echo of the last byte of the command.
Wait one bit time after each echo before sending the next byte.
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•
•
•
•
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4.9152 MHz
9.8304 MHz
9.8304 MHz
Frequency
32.768 kHz
External
READ (read memory)
WRITE (write memory)
IREAD (indexed read)
IWRITE (indexed write)
READSP (read stack pointer)
RUN (run user program)
lists external frequencies required to achieve a standard
Table 10-3. Monitor Baud Rate Selection
Monitor ROM (MON)
for this limit.
V
V
IRQ
V
V
TST
TST
DD
SS
PTC1
X
X
0
1
Section 23. Electrical
2.4576 MHz
2.4576 MHz
2.4576 MHz
2.4576 MHz
Frequency
Internal
MC68HC908LJ12
Freescale Semiconductor
Baud Rate
(BPS)
9600
9600
9600
9600
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Rev. 2.1