參數(shù)資料
型號(hào)： M30624FGMFP
元件分類： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 10 MHz, MICROCONTROLLER, PQFP100
封裝： PLASTIC, QFP-100
文件頁數(shù)： 21/30頁
文件大小： 379K
代理商： M30624FGMFP
Rev.3.01
2005.02.07
page 28 of 111
REJ03B0106-0301
4506 Group
Fig. 23 Count timing diagram at CNTR input
(8) Timer input/output pin (P12/CNTR pin)
CNTR pin is used to input the timer 2 count source and output the
timer 1 and timer 2 underflow signal divided by 2.
The P12/CNTR pin function can be selected by bit 0 of register
W6. The CNTR output signal can be selected by bit 1 of register
W6.
When the CNTR input is selected for timer 2 count source, timer 2
counts the falling waveform of CNTR input.
(9) Precautions
Note the following for the use of timers.
Prescaler
Stop the prescaler operation to change its frequency dividing ratio.
Count source
Stop timer 1 or 2 counting to change its count source.
Reading the count value
Stop timer 1 or 2 counting and then execute the TAB1 or TAB2 in-
struction to read its data.
Writing to the timer
Stop timer 1 or 2 counting and then execute the T1AB or T2AB in-
struction to write its data.
Writing to reload register R1
When writing data to reload register R1 while timer 1 is operating,
avoid a timing when timer 1 underflows.
0316
0216
0116
0016
FF16
FE16
CNTR input
Timer 2 count
Timer 2 interrupt
request flag
(T2F)
(Note)
Note: This is an example when “FF16” is set to timer 2 reload register R2L.
Timer 1 and timer 2 count start timing and count time when op-
eration starts
Count starts from the first rising edge of the count source (2) af-
ter timer 1 and timer 2 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 2, timer
2 operates synchronizing with the falling edge of CNTR input.
Fig. 24 Timer count start timing and count time when opera-
tion starts (T1, T2)
(1) Timer
Count Source
Timer Value
Timer Underflow
Signal
3
21
032
103
2
Count Source
(CNTR input)
(2)
(3)
(4)
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