MC68HC11KW1 Datasheet, PDF (154/238 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Crystal EXTAL
oscillator
÷2
÷4
÷ 2¹²
÷ 2³
Baud
÷ 1, 2, 3, 4,…, 8191
SBR[12:0]
Prescaler
÷ 2, 4, 8,16, 32, 64, 128
SPR[2:0]
÷ 2⁶
Prescaler
÷ 1, 2, 4, 8
RTR[1:0]
SCI receiver clock
÷ 16
SCI transmitter clock
(baud rate)
E clock
Internal bus clock
PH2 (for CPU, PWM,
A/D and memory)
SPI
Pulse accumulator
Real time interrupt
Prescaler
÷ 1, 4, 16, 64
CR[1:0]
Set
Q
FF1
Set
Q
FF2
Clear COP timer
Reset Q
+
Reset Q
Force COP
9
System reset
reset
Prescaler
÷ 1, 4, 8, 16
PR2B, PR2A
PK7/
ECIN
Clock
conf iguration
ECEB, ECEA
TCNT2
T2OF
IC/OC
Prescaler
÷ 1, 4, 16, or use
Timer 1 rate
PR3B, PR3A
PJ7/
ECIN
Clock
conf iguration
ECEB, ECEA
TCNT3
T3OF
IC/OC
Prescaler
÷ 1, 4, 8, 16
PR[1:0]
TCNT1
T1OF
IC/OC
Figure 9-1 Timer clock divider chains
TIMING SYSTEM
MC68HC11KW1
9-2