參數(shù)資料
型號(hào)： M34501E4FP
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述： 單芯片4位微機(jī)的CMOS
文件頁(yè)數(shù)： 28/113頁(yè)
文件大?。?/td> 1252K
代理商： M34501E4FP
28
4501 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
(8) Timer input/output pin (P1
2
/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 P1
2
/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.
Fig. 23 Count timing diagram at CNTR input
(9) Precautions
Note the following for the use of timers.
Prescaler
Stop the prescaler operation to change its frequency dividing ra-
tio.
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
instruction to read its data.
Writing to the timer
Stop timer 1 or 2 counting and then execute the T1AB or T2AB
instruction to write its data.
Writing to reload register R1
When writing data to reload register R1 while timer 1 is operat-
ing, avoid a timing when timer 1 underflows.
03
16
02
16
01
16
00
16
FF
16
FE
16
CNTR input
Timer 2 count
Timer 2 interrupt
request flag
(T2F)
(Note)
Note: This is an example when
“
FF
16
”
is set to timer 2 reload register R2L.
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