mc68hc05bs8 Freescale Semiconductor, Inc, mc68hc05bs8 Datasheet - Page 53

• Manufacturer Part Number: mc68hc05bs8
• Description: Mc68hc05 Family Of Low-cost Single-chip Microcontrollers.
• Manufacturer: Freescale Semiconductor, Inc

MC68HC05BS8
COMPARE REGISTER
Note:
Note:
INTERNAL
OUTPUT COMPARE
OUTPUT COMPARE
CLOCKS
TIMER
OVERFLOW
FLAG (TOF)
COUNTER
INTERNAL
PROCESSOR
CLOCKS
Flag and TCMP
TIMER
The TOF bit is set at timer state T11 (transition of counter from $FFFF to $0000).
INTERNAL
(16 BIT)
It is cleared by a read of the timer status register during the internal processor
clock high time followed by a read of the counter low register.
TIMER
PROCESSOR
REGISTER
COUNTER
CLOCK
1. The CPU write to the compare registers may take place at any time, but a compare only occurs at
2. The output compare flag is set at the timer state T11 that follows the comparison match ($F547 in
INTERNAL
T00
T01
T10
T11
(16 BIT)
LATCH
the timer state T01. Thus a 4-cycle difference may exist between the write to the compare register
and the actual compare.
this example).
CLOCK
T00
T01
T10
T11
Figure 6-4 Timer State Timing Diagram for Output Compare
$FFFE
$F455
Figure 6-5 Timer State Diagram for Timer Overflow
$FFFF
CPU writes $F457
$F456
TIMERS
Note 1
Note 1
Note 2
$0000
$F457
$F457
$0001
$F458
$0002
$F459
TPG
6