參數(shù)資料
型號(hào): MC68HC05F4FB
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 1.789 MHz, MICROCONTROLLER, PQFP44
封裝: QFP-44
文件頁數(shù): 93/130頁
文件大小: 2089K
代理商: MC68HC05F4FB
MC68HC05F4
MOTOROLA
6-15
16-BIT PROGRAMMABLE TIMER
6
Figure 6-4 Timer state timing diagram for output compare
Figure 6-5 Timer state timing diagram for timer overow
Internal
processor clock
16-bit
counter
$F456
$F457
$F458
$F459
Internal
timer clocks
T00
T01
T11
T10
$F457
CPU writes $F457
Output compare
ag and TCMP1,2
Note:
1
The CPU write to the compare registers may take place at any time, but a compare only occurs at timer state
T01. Thus a four cycle difference may exist between the write to the compare register and the actual compare.
2
The output compare ag is set at the timer state T11 that follows the comparison match ($F457 in this example).
Output compare
register
Compare register
latch
(Note 2)
(Note 1)
Internal
processor clock
16-bit
counter
$FFFF
$0000
$0001
$0002
Internal
timer clocks
T00
T01
T11
T10
Note:
The timer overow ag 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 overow
ag
TPG
61
05F4Book Page 15 Tuesday, August 5, 1997 1:10 pm
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