參數(shù)資料
型號(hào)： HMS91C7134
英文描述： [Monitor]
中文描述： [顯示器]
文件頁數(shù)： 39/86頁
文件大?。?/td> 1508K
代理商： HMS91C7134
HMS91C7134
November.2001 ver1.0
39
15. TIMER
HMS9xC7134 has two 16-bit timers/counters (Timer0, Timer1) to be placed in 80C51 core and one 16-bit auto-reload timer(Timer2) for
dynamic PWM.
15.1 Timer0 and Timer1
The external input pin that the Timer/Counter0 and Timer/
Counter1 in 80C51 core have is eliminated. In the timer function,
timer register is incremented every machine cycle. Thus, you can
think of it as counting machinecycles. Since a machine cycle con-
sists of 12 oscillator periods, the count rate is 1/12 of the oscilla-
tor frequency.
Timer 0, Timer 1 have four operating modes. These modes is se-
lected by bit-pairs(M1, M0) in TMOD.
Table 15-1 Timer Mode Control register(TMOD) RESET VALUE:00000000B
Table 15-2 Description of the TMOD bits
7
6
5
4
3
2
2
0
GATE
C/T
M1
M0
GATE
C/T
M1
M0
BIT
SYMBOL
FUNCTION
7,3
GATE
Gating control when set. Timer “x” is enabled only while “INTx” pin is high
and “TRx” control bit is set. When cleared Timer”x” is enabled whenever
“TRx”control bit is set.
Timer or Counter selector
6,2
C/T
0 : Timer
1 : Counter, not supported.
Operating modes
7 to 0
M1, M0
0, 0
0, 1
1, 0
1, 1
8-bit Timer °THx” with “TLx” as 5-bit prescaler
16-bit Timer ”THx” and “TLx” are cascaded : there is no prescaler
8-bit auto-reload Timer “THx” holds a value which is to be reloaded into
“TLx” each time it overflows.
Timer0 : TL0 is an 8-bit Timer controlled by the standard
Timer 0 control bit.
: TH0 is an 8-bit timer only controlled by Timer 1 control bit.
Timer1 : Timer 1 stopped.
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