參數(shù)資料
型號(hào): M34556M4H-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PDSO42
封裝: 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42
文件頁數(shù): 80/147頁
文件大?。?/td> 1087K
代理商: M34556M4H-XXXFP
Rev.3.02
Dec 22, 2006
page 36 of 142
REJ03B0025-0302
4556 Group
Prescaler and Timer 1 count start timing and count time when op-
eration starts
Count starts from the first rising edge of the count source (2) af-
ter Prescaler and Timer 1 operations start (1).
Time to first underflow (3) is shorter (for up to 1 period of the
count source) than time among next underflow (4) by the timing
to start the timer and count source operations after count starts.
When selecting CNTR input as the count source of Timer 1,
Timer 1 operates synchronizing with the falling edge of CNTR in-
put.
Fig. 24 Timer count start timing and count time when opera-
tion starts (Prescaler and Timer 1)
Timer 2 and Timer LC count start timing and count time when op-
eration starts
Count starts from the rising edge (2) after the first falling edge of
the count source, after Timer 2 and Timer LC operations start (1).
Time to first underflow (3) is different from time among next un-
derflow (4) by the timing to start the timer and count source
operations after count starts.
Fig. 25 Timer count start timing and count time when opera-
tion starts (Timer 2 and Timer LC)
(1) Timer Start
Count Source
Timer Value
Timer Underflow signal
3
2
1
032
103
(4)
(3)
(2)
2
Count Source
Selecting CNTR input
falling edge
(1) Timer Start
Count Source
Timer Value
Timer Underflow Signal
3
2
1
032
103
(4)
(3)
(2)
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