參數(shù)資料
型號(hào): SAF-C509-L
廠商: SIEMENS AG
元件分類: 8位微控制器
英文描述: 8-Bit CMOS Microcontroller
中文描述: 8位CMOS微控制器
文件頁數(shù): 41/74頁
文件大?。?/td> 1607K
代理商: SAF-C509-L
C509-L
Semiconductor Group
40
Timer / Counter 0 and 1
Timer/Counter 0 and 1 can be used in four operating modes as listed in
table 6
:
In the “timer” function (C/T = ‘0’) the register is incremented by a count rate of
f
OSC
/6 up to
f
OSC
/32.
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
/12. External inputs INT0 and INT1 (P3.2, P3.3) can be
programmed to function as a gate to facilitate pulse width measurements.
Figure 17
illustrates the
input clock logic of timer 0/1.
Figure 17
Timer/Counter 0 and 1 Input Clock Logic
Table 6
Timer/Counter 0 and 1 Operating Modes
Mode
Description
TMOD
Input Clock
M1
M0
internal
f
OSC
/6x32 up to
f
OSC
/48x32
external (max)
f
OSC
/12x32
0
8-bit timer/counter with a
divide-by-32 prescaler
0
0
1
16-bit timer/counter
0
1
f
OSC
/6 up to
f
OSC
/
48
f
OSC
/12
2
8-bit timer/counter with
8-bit autoreload
1
0
3
Timer/counter 0 used as one
8-bit timer/counter and one
8-bit timer
Timer 1 stops
1
1
TxP1
TxP0
Prescaler
0
0
6
0
1
12
1
0
24
1
1
48
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