參數(shù)資料
型號: GMS90L320
英文描述: 8-Bit Single-Chip Microcontrollers(低電壓,8位單片微控制器)
中文描述: 8位單芯片微控制器(低電壓,8位單片微控制器)
文件頁數(shù): 19/46頁
文件大?。?/td> 683K
代理商: GMS90L320
GMS90C320
OCT. 2000 Ver 1.2
15
Timer / Counter 0 and 1
Timer/Counter 0 and 1 can be used in four operating modes as listed in
Table 4
:
In the “timer” function (C/T = “0”) the register is incremented every machine cycle. Therefore the count rate is
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).Sinceittakestwomachinecyclestodetectafallingedgethemax. countrateis
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.
.
. Externalinputs
Figure 2 Timer/Counter 0 and 1 Input Clock Logic
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
1
16-bit timer/counter
X
X
0
1
2
8-bit timer/counter with 8-bit
autoreload
X
X
1
0
3
Timer/counter 0 used as one
8-bit timer/counter and one 8-
bit timer
Timer 1 stops
X
X
1
1
-------------------
-------------------
---------------
---------------
---------------
---------------
---------------
---------------
OSC
12
OSC
24
f
OSC
÷
12
C/T
TMOD
0
1
GATE
TMOD
TR 0/1
TCON
P3.4/T0
P3.5/T1
max. f
OSC
/24
P3.2/INT0
P3.3/INT1
Timer 0/1
Input Clock
Control
OSC
12
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