Datasheet

M-Bus Module
MOTOROLA MCF5206e USER’S MANUAL 13-7
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frequency. The serial bit clock frequency is equal to the CPU clock divided as shown in
Table 13-2, which also shows the serial bit clock frequency for a 33 MHz internal operating
frequency
2
. Note that the MFDR frequency value can be changed at any point in a pro-
gram.
2.
In previous implementations of the M-Bus (e.g., MC68307), the MBC[5] bit was not implemented. Clearing
this bit in software maintains complete compatibility with such products.
Table 13-2. MBUS Prescaler Values
MBC5-0
(HEX)
DIVIDER
(DEC)
MBC5-0
(HEX)
DIVIDER
(DEC)
00 28 20 20
01 30 21 22
02 34 22 24
03 40 23 26
04 44 24 28
05 48 25 32
06 56 26 36
07 68 27 40
08 80 28 48
09 88 29 56
0A 104 2A 64
0B 128 2B 72
0C 144 2C 80
0D 160 2D 96
0E 192 2E 112
0F 240 2F 128
10 288 30 160
11 320 31 192
12 384 32 224
13 480 33 256
14 576 34 320
15 640 35 384
16 768 36 448
17 960 37 512
18 1152 38 640
19 1280 39 768
1A 1536 3A 896
1B 1920 3B 1024
1C 2304 3C 1280
1D 2560 3D 1536
1E 3072 3E 1792
1F 3840 3F 2048
Fr
eescale S
emiconduct
or
, I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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