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A - SIMPLE 8-BIT TIMER D - 8-BIT PWM
MICROPROCESSOR{ -1 ~ ,E,,, UP COUNiER 8-611 UPlOOWN FLIP-FLOP h PWM OUTPUT
tp
&BIT LATCH
DATA ROLLOVER OUTPUT MA ,H
BUS U I
I - MICROPROCESSOR
-
DATA
DECODED WRITE STROBE l- BUS
HA
I
MICROPROCESSOR DECODE0 WRITE STROBE
CLOCK OR EXTERNAL CLOCK COMPARATOR
CLOCK
B - RELOADING 8-BIT TIMER
EBlT LATCH 8-BIT UP COUNTER
MICROPROCESSOR
DATA 0-
BUS
-39 II
DECODED WRITE STROBE
MICROPROCESSOR
CLOCK OR EXTERNAL
CLOCK
MICROPROCESSOR
DATA
5'
+ CLR
MICROPROCESSOR
CLOCK OR EXTERNAL
CLOCK
c
k
Figure 3.5
Timers.
