Freescale Semiconductor, Inc.
OSCILLATOR AND
CLOCK GENERATOR
(DIVIDE BY FOUR)
AS
E CLOCK
INTERNAL BUS CLOCK (PH2)
PRESCALER
(÷ 2, 4, 16, 32)
SPI
SPR[1:0]
PRESCALER
(÷ 1, 3, 4, 13)
SCP[1:0]
PRESCALER
(÷ 1, 2, 4,....128)
SCR[2:0]
SCI RECEIVER CLOCK
SCI TRANSMIT CLOCK
PULSE ACCUMULATOR
÷16
6
E÷2
PRESCALER
(÷ 1, 2, 4, 8)
RTR[1:0]
13
E÷2
REAL-TIME INTERRUPT
÷4
15
E÷2
PRESCALER
(÷ 1, 4, 8, 16)
PR[1:0]
PRESCALER
(÷1, 4, 16, 64)
CR[1:0]
TCNT
TOF
FF1
FF2
S
R
Q
Q
S
R
Q
FORCE
Q
COP
RESET
IC/OC
CLEAR COP
TIMER
SYSTEM
RESET
Figure 9-1 Timer Clock Divider Chains
TIMING SYSTEM
MC68HC11F1
9-2
TECHNICAL DATA
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