参数资料
型号: MC68HC705BS8FB
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.2 MHz, MICROCONTROLLER, PQFP44
封装: PLASTIC, QFP-44
文件页数: 92/128页
文件大小: 9691K
代理商: MC68HC705BS8FB
8-6
MC68HC05BS8
M-BUS SERIAL INTERFACE
8
8.3
M-Bus Registers
There are ve registers used in the M-Bus interface, these are discussed in the following
paragraphs.
8.3.1
M-Bus Address Register (MADR)
MAD1-MAD7 are the slave address bits of the M-Bus module.
8.3.2
M-Bus Frequency Register (MFDR)
FD0-FD4 are used for clock rate selection. The serial bit clock frequency is equal to the CPU clock
divided by the divider shown in Table 8-1.
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$0039
MAD7
MAD6
MAD5
MAD4
MAD3
MAD2
MAD1
0000 0000
Address
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$003A
FD4
FD3
FD2
FD1
FD0
0000 0000
Table 8-1 M-Bus Prescaler
FD4
FD3
FD2
FD1
FD0
DIVIDER
FD4
FD3
FD2
FD1
FD0
DIVIDER
00000
22
10000
352
00001
24
10001
384
00010
28
10010
448
00011
34
10011
544
00100
44
10100
704
00101
48
10101
768
00110
56
10110
896
00111
68
10111
1088
01000
88
11000
1408
01001
96
11001
1536
0
1
0
1
0
112
1
0
1
0
1792
0
1
0
1
136
1
0
1
2176
0
1
0
176
1
0
2816
0
1
0
1
192
1
0
1
3072
0
1
0
224
1
0
3584
0
1
272
1
4352
TPG
64
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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