mc68hc908lj24 Freescale Semiconductor, Inc, mc68hc908lj24 Datasheet - Page 172
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mc68hc908lj24
Manufacturer Part Number
mc68hc908lj24
Description
M68hc08 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908LJ24.pdf
(464 pages)
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Monitor ROM (MON)
10.4.5 Commands
Data Sheet
172
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.
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.
•
•
•
•
•
•
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)
V
V
IRQ
V
V
TST
TST
DD
SS
PTC1
X
X
0
1
2.4576 MHz
2.4576 MHz
2.4576 MHz
2.4576 MHz
Frequency
MC68HC908LJ24/LK24 — Rev. 2.1
Internal
Freescale Semiconductor
Baud Rate
(BPS)
9600
9600
9600
9600
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