![](http://datasheet.mmic.net.cn/30000/MC68HC908AS60AVFU_datasheet_2370139/MC68HC908AS60AVFU_219.png)
Monitor ROM (MON)
Functional Description
MC68HC908AZ60A — Rev 2.0
Technical Data
MOTOROLA
Monitor ROM (MON)
219
14.4.7 MC68HC908AZ60A Baud Rate
The MC68HC908AZ60A features a monitor mode which is optimised to
operate with either a 4.9152 MHz crystal clock source (or multiples of
4.9152 MHz) or a 4 MHz crystal (or multiples of 4 MHz). This supports
designs which use the MSCAN module, which is generally clocked from
a 4 MHz, 8 MHz or 16 MHZ internal reference clock. The table below
outlines the available baud rates for a range of crystals and how they can
match to a PC baud rate.
Care should be taken when setting the baud rate since incorrect
baud rate setting can result in communications failure.
Table 14-10 MC68HC908AZ60A Monitor Baud Rate Selection
Baud rate
Closest PC baud PC
Error %
Clock freq
PTC3=0
PTC3=1
PTC3=0
PTC3=1
PTC3=0
PTC3=1
32kHz
57.97
28.98
57.6
28.8
0.64
0.63
1MHz
1811.59
905.80
1800
900
0.64
2MHz
3623.19
1811.59
3600
1800
0.64
4MHz
7246.37
3623.19
7200
3600
0.64
4.194MHz
7597.83
3798.91
7680
3840
1.08
4.9152MHz
8904.35
4452.17
8861
4430
0.49
0.50
8MHz
14492.72
7246.37
14400
7200
0.64
16MHz
28985.51
14492.75
28800
14400
0.64