參數(shù)資料
型號: GMS90L31
英文描述: 8-Bit CMOS Microcontrollers(高性價(jià)比的51單片機(jī),片內(nèi)無ROM,128字節(jié)RAM,低電壓)
中文描述: 8位CMOS微控制器(高性價(jià)比的51單片機(jī),片內(nèi)無光盤,128字節(jié)的RAM,低電壓)
文件頁數(shù): 19/59頁
文件大?。?/td> 812K
代理商: GMS90L31
Timer / Counter 0 and 1
Timer/Counter 0 and 1 can be used in four operating modes as listed in
table 4:
Table 4
Timer/Counter 0 and 1 Operating Modes
Mode
Description
TMOD
Input Clock
Gate
C/T
M1
M0
internal
external
(max)
0
8-bit timer/counter with a
divide-by-32 prescaler
X
X
0
0
f
OSC
/
12
32
f
OSC
/
24
32
1
16-bit timer/counter
X
X
0
1
f
OSC
/
12
f
OSC
/
24
2
8-bit timer/counter with
8-bit autoreload
X
X
1
0
f
OSC
/
12
f
OSC
/
24
3
Timer/counter 0 used as one
8-bit timer/counter and one
8-bit timer
Timer 1 stops
X
X
1
1
f
OSC
/
12
f
OSC
/
23
In the "timer" function (C/T = "0") the register is incremented every machine cycle. therefore the count
rate is
f
OSC
/
12.
In the "counter" function the register is incremented in response to a 1-to-0 transition at its corresponding
external input pin (P3.4/T0, P3.5/T1). Since it takes two machine cycles to detect a falling edge the max.
count rate is
f
OSC
/
24.
External inputs INT0 and INT1 (P3.2, P3.3) can be programmed to function as a gate
to facilitate pulse width measurements.
Figure 2
illustrates the input clock logic.
Figure 2
Timer/Counter 0 and 1 Input Clock Logic
8-Bit CMOS Microcontroller
GMS90 Series
MAY. 1998
19
LG Semicon MCU
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