mc68hc05bs8 Freescale Semiconductor, Inc, mc68hc05bs8 Datasheet - Page 66

• Manufacturer Part Number: mc68hc05bs8
• Description: Mc68hc05 Family Of Low-cost Single-chip Microcontrollers.
• Manufacturer: Freescale Semiconductor, Inc

8
8.3
There are five registers used in the M-Bus interface, these are discussed in the following
paragraphs.
8.3.1
MAD1-MAD7 are the slave address bits of the M-Bus module.
8.3.2
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.
8-6
FD4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Address
Address
$003A
$0039
FD3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
M-Bus Registers
M-Bus Address Register (MADR)
M-Bus Frequency Register (MFDR)
MAD7
bit 7
bit 7
FD2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
MAD6
bit 6
bit 6
FD1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
MAD5
bit 5
bit 5
FD0
M-BUS SERIAL INTERFACE
Table 8-1 M-Bus Prescaler
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
DIVIDER
MAD4
bit 4
bit 4
FD4
112
136
176
192
224
272
22
24
28
34
44
48
56
68
88
96
MAD3
bit 3
bit 3
FD3
FD4
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
MAD2
bit 2
bit 2
FD2
FD3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
MAD1
bit 1
bit 1
FD1
FD2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
bit 0
bit 0
FD0
FD1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0000 0000
0000 0000
on reset
on reset
MC68HC05BS8
FD0
State
State
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
DIVIDER
1088
1408
1536
1792
2176
2816
3072
3584
4352
352
384
448
544
704
768
896
TPG