XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 219

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

14.4.7 MC68HC908AZ60A Baud Rate
MC68HC908AZ60A — Rev 2.0
MOTOROLA
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.
4.9152MHz
4.194MHz
Clock freq
16MHz
32kHz
Table 14-10 MC68HC908AZ60A Monitor Baud Rate Selection
1MHz
2MHz
4MHz
8MHz
14492.72
28985.51
PTC3=0
3623.19
7246.37
7597.83
8904.35
1811.59
57.97
Monitor ROM (MON)
Baud rate
14492.75
PTC3=1
3623.19
3798.91
4452.17
7246.37
1811.59
905.80
28.98
Closest PC baud PC
PTC3=0
14400
28800
1800
3600
7200
7680
8861
57.6
PTC3=1
14400
1800
3600
3840
4430
7200
28.8
900
Functional Description
PTC3=0
Monitor ROM (MON)
0.64
0.64
0.64
0.64
1.08
0.49
0.64
0.64
Error %
Technical Data
PTC3=1
0.63
0.64
0.64
0.64
1.08
0.50
0.64
0.64
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