MC68HC912BL16 Datasheet, PDF (64/128 Pages) Freescale Semiconductor, Inc – 16-Bit Microcontroller

Freescale Semiconductor, Inc.
EXTAL
XTAL
OSCILLATOR
EXTALi
EXTALi
SYSCLK
÷2
intwai
(Wait)
SLOW
MODE
CLOCK
SLWCLK
T CLOCK ^TCLKs
GENERATOR
TO CPU
TO BDM,
E AND P CLOCK ^ECLK BUSES, SPI,
GENERATOR
ATD,SCI,TIM,
RTI, COP,
PCLK PWM,
FEE,EE,RAM
HC912BL16 CLOCK DIV CHAIN
Figure 13 Clock Divider Chain
÷ 2²
÷ 2¹¹
REGISTER: RTICTL
BIT: RTBYP
REGISTER: RTICTL 0:0:0
BITS: RTR2, RTR1, RTR0
REGISTER: COPCTL 0:0:0
BITS: CR2, CR1, CR0
0:0:1
0:0:1
÷2
0:1:0
÷4
0:1:0
SC0BD
MODULUS DIVIDER:
÷1,2,3,4,5,6,...,8190,8191
÷2
0:1:1
÷2
1:0:0
÷4
0:1:1
÷4
1:0:0
÷2
1:0:1
÷4
1:0:1
SCI0
RECEIVE
BAUDRATE((16x)
÷ 2⁴
SCI0
TRANSMIT
BAUD RATE (1x)
÷2
1:1:0
÷2
1:1:1
÷2
1:1:0
÷2
1:1:1
TO RTI
TO COP
HC912BL16 CLOCK CHAIN SCI RTI COP
Figure 14 Clock Chain for SCI, RTI, COP
MC68HC912BL16
64
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