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參數資料
型號: W77C58
廠商: WINBOND ELECTRONICS CORP
元件分類: 8位微控制器
英文描述: 8 BIT MICROCONTROLLER
中文描述: 8位微控制器
文件頁數: 49/71頁
文件大小: 516K
代理商: W77C58
Preliminary W77C58
Publication Release Date: September 1999
- 49 - Revision A1
1/4
1/12
T0M = CKCON.3
(T1M = CKCON.4)
C/T = TMOD.2
(C/T = TMOD.6)
0
Interrupt
T0 = P3.4
(T1 = P3.5)
TH0
(TH1)
TL0
(TL1)
TF0
(TF1)
TR0 = TCON.4
(TR1 = TCON.6)
GATE = TMOD.3
(GATE = TMOD.7)
INT0 = P3.2
(INT1 = P3.3)
7
0
TFx
7
0
Timer 1 functions are shown in brackets
1
0
1
Clock Source
Mode input
div. by 4 osc/1
div. by 64 osc/16
div. by 1024 osc/256
Figure 12: Timer/Counter Mode 2
Mode 3
Mode 3 has different operating methods for the two timer/counters. For timer/counter 1, mode 3
simply freezes the counter. Timer/Counter 0, however, configures TL0 and TH0 as two separate 8 bit
count registers in this mode. The logic for this mode is shown in the figure. TL0 uses the
Timer/Counter 0 control bits C/
T
, GATE, TR0, INT0 and TF0. The TL0 can be used to count clock
cycles (clock/12 or clock/4) or 1-to-0 transitions on pin T0 as determined by C/
T
(TMOD.2). TH0 is
forced as a clock cycle counter (clock/12 or clock/4) and takes over the use of TR1 and TF1 from
Timer/Counter 1. Mode 3 is used in cases where an extra 8 bit timer is needed. With Timer 0 in Mode
3, Timer 1 can still be used in Modes 0, 1 and 2., but its flexibility is somewhat limited. While its basic
functionality is maintained, it no longer has control over its overflow flag TF1 and the enable bit TR1.
Timer 1 can still be used as a timer/counter and retains the use of GATE and INT1 pin. In this
condition it can be turned on and off by switching it out of and into its own Mode 3. It can also be used
as a baud rate generator for the serial port.
1/4
1/12
T0M = CKCON.3
1
Interrupt
C/T = TMOD.2
0
T0 = P3.4
TH0
TL0
TR0 = TCON.4
GATE = TMOD.3
TR1 = TCON.6
INT0 = P3.2
7
0
TF1
7
0
Interrupt
TF0
0
1
Clock Source
Mode input
div. by 4 osc/1
div. by 64 osc/16
div. by 1024 osc/256
Figure 13. Timer/Counter 0 Mode 3
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