MC68HC05X16 Datasheet, PDF (102/232 Pages) Freescale Semiconductor, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

Freescale Semiconductor, Inc.
Internal
processor clock
Internal
timer clocks
 _T00


T01
 ^T10
 ^T11
16-bit
counter
Output compare
register
$F456
(Note 1)
CPU writes $F457
$F457
$F458
$F457
$F459
Compare register
latch
(Note 1)
6
Output compare
flag and TCMP1,2
(Note 2)
Note:
The CPU write to the compare registers may take place at any time, but a compare only occurs at timer state
T01. Thus a four cycle difference may exist between the write to the compare register and the actual compare.
Figure 6-4 Timer state timing diagram for output compare
Internal
processor clock
Internal
timer clocks
 _T00


T01
 ^T10
 ^T11
16-bit
counter
$FFFF
$0000
$0001
$0002
Timer overflow
flag
Note:
The timer overflow flag is set at timer state T11 (transition of counter from $FFFF to $0000). 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.
Figure 6-5 Timer state timing diagram for timer overflow
PROGRAMMABLE TIMER
MC68HC05X16
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Rev. 1
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