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參數資料
型號: MC68HC05X4
廠商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數: 123/156頁
文件大小: 926K
代理商: MC68HC05X4
16-Bit Programmable Timer
Timer state diagrams
MC68HC05X4 Rev 1.0
MOTOROLA
16-Bit Programmable Timer
For More Information On This Product,
Go to: www.freescale.com
123
15-ptimer
Figure 14. Timer state timing diagram for output compare
Figure 15. Timer state timing diagram for timer overflow
Internal
processor clock
16-bit
counter
$F456
$F457
$F458
$F459
Internal
timer clocks
T00
T01
T11
T10
$F457
CPU writes $F457
Output compare
flag and TCMP
Note: (1) The CPU write to the compare registers may take place at any time, but a compare
only occurs at timer state T01. Thus a four cycle difference may exist between the write to
the compare register and the actual compare.
Note: (2) The output compare flag is set at the timer state T11 that follows the comparison
match ($F457 in this example).
Output compare
register
Compare register
latch
(Note 2)
(Note 1)
(Note 1)
Internal
processor clock
16-bit
counter
$FFFF
$0000
$0001
$0002
Internal
timer clocks
T00
T01
T11
T10
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.
Timer overflow
flag
F
Freescale Semiconductor, Inc.
n
.
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