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參數資料
| 型號： | W77LE532 |
| 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： | 51/85頁 |
| 文件大小： | 2458K |
| 代理商： | W77LE532 |
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Preliminary W77LE532
Publication Release Date: May 14, 2003
- 51 - Revision A1
TIMER/COUNTER 2
Timer/Counter 2 is a 16 bit up/down counter which is configured by the T2MOD register and controlled
by the T2CON register. Timer/Counter 2 is equipped with a capture/reload capability. As with the
Timer 0 and Timer 1 counters, there exists considerable flexibility in selecting and controlling the
clock, and in defining the operating mode. The clock source for Timer/Counter 2 may be selected for
either the external T2 pin (C/T2 = 1) or the crystal oscillator, which is divided by 12 or 4 (C/T2 = 0).
The clock is then enabled when TR2 is a 1, and disabled when TR2 is a 0.
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
CAPTURE MODE
The capture mode is enabled by setting the
CP
mode, Timer/Counter 2 serves as a 16 bit up counter. When the counter rolls over from FFFFh to
0000h, the TF2 bit is set, which will generate an interrupt request. If the EXEN2 bit is set, then a
negative transition of T2EX pin will cause the value in the TL2 and TH2 register to be captured by the
RCAP2L and RCAP2H registers. This action also causes the EXF2 bit in T2CON to be set, which will
also generate an interrupt. Setting the T2CR bit (T2MOD.3), the W77LE532 allows hardware to reset
timer 2 automatically after the value of TL2 and TH2 have been captured.
bit in the T2CON register to a 1. In the capture
RL
/
2
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