μPD78F920x ONLY) User’s Manual U18172EJ3V0UD 128 (17) Changin" />
參數(shù)資料
型號： UPD78F9201MA-CAC-A
廠商： Renesas Electronics America
文件頁數(shù)： 36/158頁
文件大?。?/td> 0K
描述： MCU 8BIT 2KB FLASH 128B RAM
標(biāo)準(zhǔn)包裝： 400
系列： 78K0S/Kx1+
核心處理器： 78K0S
芯體尺寸： 8-位
速度： 10MHz
外圍設(shè)備： LVD，POR，PWM，WDT
輸入/輸出數(shù)： 7
程序存儲器容量： 2KB（2K x 8）
程序存儲器類型： 閃存
RAM 容量： 128 x 8
電壓 - 電源 (Vcc/Vdd)： 2 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 4x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 10-LSSOP（0.225"，5.72mm 寬）
包裝： 托盤
CHAPTER 6 16-BIT TIMER/EVENT COUNTER 00 (
μPD78F920x ONLY)
User’s Manual U18172EJ3V0UD
128
(17) Changing compare register during timer operation
<1>
With the 16-bit timer capture/compare register 0n0 (CR0n0) used as a compare register, when changing
CR0n0 around the timing of a match between 16-bit timer counter 00 (TM00) and 16-bit timer
capture/compare register 0n0 (CR0n0) during timer counting, the change timing may conflict with the
timing of the match, so the operation is not guaranteed in such cases. To change CR0n0 during timer
counting, INTTM000 interrupt servicing performs the following operation.
<Changing cycle (CR000)>
1. Disable the timer output inversion operation at the match between TM00 and CR000 (TOC001 = 0).
2. Disable the INTTM000 interrupt (TMMK000 = 1).
3. Rewrite CR000.
4. Wait for 1 cycle of the TM00 count clock.
5. Enable the timer output inversion operation at the match between TM00 and CR000 (TOC001 = 1).
6. Clear the interrupt request flag of INTTM000 (TMIF000 = 0).
7. Enable the INTTM000 interrupt (TMMK000 = 0).
<Changing duty (CR010)>
1. Disable the timer output inversion operation at the match between TM00 and CR010 (TOC004 = 0).
2. Disable the INTTM000 interrupt (TMMK000 = 1).
3. Rewrite CR010.
4. Wait for 1 cycle of the TM00 count clock.
5. Enable the timer output inversion operation at the match between TM00 and CR010 (TOC004 = 1).
6. Clear the interrupt request flag of INTTM000 (TMIF000 = 0).
7. Enable the INTTM000 interrupt (TMMK000 = 0).
While interrupts and timer output inversion are disabled (1 to 4 above), timer counting is continued. If
the value to be set in CR0n0 is small, the value of TM00 may exceed CR0n0. Therefore, set the value,
considering the time lapse of the timer clock and CPU after an INTTM000 interrupt has been generated.
Remark n = 0 or 1
<2>
If CR010 is changed during timer counting without performing processing <1> above, the value in
CR010 may be rewritten twice or more, causing an inversion of the output level of the TO00 pin at each
rewrite.
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