參數(shù)資料
型號(hào): Q67121C2168A1
英文描述: IC-SM-16 BIT CPU
中文描述: 集成電路的Sm - 16位CPU
文件頁(yè)數(shù): 51/121頁(yè)
文件大小: 1000K
代理商: Q67121C2168A1
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Semiconductor Group
6-17
On-Chip Peripheral Components
C501
Special Function Register TMOD (Address 89H)
Reset Value : 00H
Bit
Function
GATE
Gating control
When set, timer/counter “x” is enabled only while “INT x” pin is high and “TRx”
control bit is set.
When cleared timer “x” is enabled whenever “TRx” control bit is set.
C/T
Counter or timer select bit
Set for counter operation (input from “Tx” input pin).
Cleared for timer operation (input from internal system clock).
M1
M0
Mode select bits
M1
Gate
C/T
M1
M0
89H
TMOD
Bit No.
7
6
5
4
3
2
1
0
MSB
LSB
Gate
C/T
M1
M0
Timer 1 Control
Timer 0 Control
M0
Function
0
0
8-bit timer/counter:
“THx” operates as 8-bit timer/counter
“TLx” serves as 5-bit prescaler
0
1
16-bit timer/counter.
“THx” and “TLx” are cascaded; there is no prescaler
1
0
8-bit auto-reload timer/counter.
“THx” holds a value which is to be reloaded into “TLx” each
time it overflows
1
1
Timer 0 :
TL0 is an 8-bit timer/counter controlled by the standard
timer 0 control bits. TH0 is an 8-bit timer only controlled by
timer 1 control bits.
Timer 1 :
Timer/counter 1 stops
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