參數(shù)資料
型號(hào): MB89P637-SH
元件分類: 微控制器/微處理器
英文描述: 8-BIT, OTPROM, 10 MHz, MICROCONTROLLER, PDIP64
封裝: SHRINK, DIP-64
文件頁數(shù): 131/153頁
文件大?。?/td> 7326K
代理商: MB89P637-SH
MB89630 SERIES HARDWARE MANUAL
2-56
(3) Description of registers
(a) Timer-control register (TMCR)
This 6-bit register selects and controls various operations of the counter, and controls interrupts.
[Bit 5] TCR: Counter-clear bit
Bit 5 is used to clear the counter. The meaning of each bit to be written is as follows:
The read value of this bit is always 1.
[Bits 4 and 3] TCS1 and TCS0: Timer/counter operation-mode select bits
These bits are used to select the timer/counter operation mode and to determine the detection edge of
the external-count clock pulse to be detected in the counter- operation mode. The counter-operation
mode and the detection edge of the external-count clock pulse are selected as shown below.
Table 2.7 Selection of Timer/Counter Operation Mode
[Bit 2] TCEF: Interrupt-request flag
Bit 2 is a flag for interrupt request due to counter overflow. The meaning of each bit to be read is as fol-
lows:
Note: 1 is always read when the Read Modify Write instruction is read. When interrupt-output is enabled
(TCIE = 1), an interrupt request is output to the CPU if this bit is 1.
The meaning of each bit to be written is as follows:
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