mc68hc912bc32 Freescale Semiconductor, Inc, mc68hc912bc32 Datasheet - Page 121
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mc68hc912bc32
Manufacturer Part Number
mc68hc912bc32
Description
M68hc12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC912BC32.pdf
(334 pages)
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10.8 Clock Divider Chains
Figure
peripherals:
Freescale Semiconductor
•
•
•
•
•
•
•
•
•
SCI — Serial peripheral interface
BDLC — Byte data link communications
RTI — Real-time interrupt
COP — Computer operating properly
TIM — Standard timer module
ECT — Enhanced capture timer
SPI — Serial peripheral interface
ATD — Analog-to-digital converter
BDM — Background debug mode
10-10,
÷
2
4
÷
1, 2, 3, 4, 5, 6, ..., 8190, 8191
Figure
MODULUS DIVIDER:
BAUD RATE (16x)
BAUD RATE (1x)
TRANSMIT
RECEIVE
SC0BD
SCI0
SCI0
10-11,
Figure 10-10. Clock Chain for SCI, BDLC, RTI, and COP
Figure
BITS: R1, R0
REGISTER: BCR1
÷
10-12, and
2
M68HC12B Family Data Sheet, Rev. 9.1
2
÷
÷
÷
2
2
2
BIT: RTBYP
REGISTER: RTICTL
0:0
0:1
1:0
1:1
Figure 10-13
BITS: RTR2, RTR1, AND RTR0
REGISTER: RTICTL
÷
TO BDLC
2
11
÷
÷
÷
÷
÷
÷
summarize the clock divider chains for these
2
2
2
2
2
2
0:0:1
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
0:0:0
TO RTI
REGISTER: COPCTL
BITS: CR2, CR1, AND CR0
÷
÷
÷
÷
÷
÷
4
4
4
4
2
2
Clock Divider Chains
0:0:1
0:1:0
0:1:1
1:0:0
1:0:1
1:1:0
1:1:1
0:0:0
TO COP
121
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