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MC81F4432Q 参数 Datasheet PDF下载

MC81F4432Q图片预览
型号: MC81F4432Q
PDF下载: 下载PDF文件 查看货源
内容描述: ABOV半导体的8位单芯片微控制器产品 [ABOV SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS]
分类和应用: 半导体微控制器
文件页数/大小: 198 页 / 4293 K
品牌: FINECHIPS [ FINECHIPS ]
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MC81F4x16  
15. BASIC INTERVAL TIMER  
The MC81F4x32 has one 8-bit Basic Interval Timer that is free-run and can not be stopped except  
when peripheral clock is stopped.  
The Basic Interval Timer generates the time base for watchdog timer counting. It also provides a  
Basic interval timer interrupt.  
The 8-bit Basic interval timer register (BTCR) is increased every internal count pulse which is divided  
by prescaler. Since prescaler has divided ratio by 8 to 1024, the count rate is 1/8 to 1/1024 of the  
oscillator frequency.  
As the count overflow from FFH to 00H, this overflow causes the interrupt to be generated. The Basic  
Interval Timer is controlled by the clock control register (CKCTLR).  
When write "1" to bit BTCL of CKCTLR, BTCR register is cleared to "0" and restart to count-up. The  
bit BTCL becomes "0" after one machine cycle by hardware.  
The bit WDTON decides Watchdog Timer or the normal 7-bit timer.  
Source clock can be selected by lower 3 bits of CKCTLR.  
106  
October 19, 2009 Ver.1.35