参数资料
型号: M34551E8FP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP48
封装: 7 X 10 MM, 0.65 MM PITCH, PLASTIC, QFP-48
文件页数: 5/155页
文件大小: 1329K
代理商: M34551E8FP
APPLICATION
2.3 Timers
2-24
4551 Group User’s Manual
2.3.4 Notes on use
(1)
Prescaler
Stop the prescaler operation to change its frequency dividing ratio.
(2)
Count source
Stop timer 1 or timer LC counting to change its count source.
When timer 2 count source changes from f(XCIN) to ORCLK (W23 = “0”
→ W23 = “1”), the count
value of timer 2 is initialized. However, when timer 2 count source changes from ORCLK to f(XCIN)
(W23 = “1”
→ W23 = “0”) or the same count source is set again (W23 = “0” → W23 = “0” or W23
= “1”
→ W23 = “1”), the count value of timer 2 is not initialized.
(3)
Timer 2
Timer 2 has the watchdog timer function (WDT). When timer 2 is used as the WDT, note that the
processing to initialize the count value and the execution of the WRST instruction.
(4)
Reading the count value
Stop the prescaler and then execute the TAB1 instruction to read timer 1 data.
(5)
Writing to reload register R1
When writing data to reload register R1 while timer 1 is operating, avoid a timing when timer 1
underflows.
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M34551M8 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:4-BIT SINGLE-CHIP MICROCOMPUTER
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