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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： | 49/85頁 |
| 文件大小： | 2458K |
| 代理商： | W77LE532 |
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Preliminary W77LE532
Publication Release Date: May 14, 2003
- 49 - Revision A1
Timer/Counter 0 and bit 6 of TMOD selects the function for Timer/Counter 1. In addition each
Timer/Counter can be set to operate in any one of four possible modes. The mode selection is done
by bits M0 and M1 in the TMOD SFR.
Time-Base Selection
The W77LE532 gives the user two modes of operation for the timer. The timers can be programmed
to operate like the standard 8051 family, counting at the rate of 1/12 of the clock speed. This will
ensure that timing loops on the W77LE532 and the standard 8051 can be matched. This is the default
mode of operation of the W77LE532 timers. The user also has the option to count in the turbo mode,
where the timers will increment at the rate of 1/4 clock speed. This will straight-away increase the
counting speed three times. This selection is done by the T0M and T1M bits in CKCON SFR. A reset
sets these bits to 0, and the timers then operate in the standard 8051 mode. The user should set
these bits to 1 if the timers are to operate in turbo mode.
MODE 0
In Mode 0, the timer/counters act as a 8 bit counter with a 5 bit, divide by 32 pre-scale. In this mode
we have a 13 bit timer/counter. The 13 bit counter consists of 8 bits of THx and 5 lower bits of TLx.
The upper 3 bits of TLx are ignored.
The negative edge of the clock increments the count in the TLx register. When the fifth bit in TLx
moves from 1 to 0, then the count in the THx register is incremented. When the count in THx moves
from FFh to 00h, then the overflow flag TFx in TCON SFR is set. The counted input is enabled only if
TRx is set and either GATE = 0 or
INTx
= 1. When
C
and if
C
is set to 1, then it will count 1 to 0 transitions on T0 (P3.4) for timer 0 and T1 (P3.5) for
timer 1. When the 13 bit count reaches 1FFFh the next count will cause it to roll-over to 0000h. The
timer overflow flag TFx of the relevant timer is set and if enabled an interrupts will occur. Note that
when used as a timer, the time-base may be either clock cycles/12 or clock cycles/4 as selected by
the bits TxM of the CKCON SFR.
is set to 0, then it will count clock cycles,
T
/
T
/
1/4
1/12
C/T = TMOD.2
(C/T = TMOD.6)
T0M = CKCON.3
(T1M = CKCON.4)
M1,M0 = TMOD.1,TMOD.0
(M1,M0 = TMOD.5,TMOD.4)
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
4
7
0
Timer 1 functions are shown in brackets
1
00
0
0
1
01
Clock Source
Mode
div. by 4 osc/1
div. by 64 osc/16
div. by 1024 osc/256
input
Figure 11. Timer/Counter Mode 0 & Mode 1
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相關代理商/技術參數 |
參數描述 |
|---|---|
| W77LE532_07 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77LE58 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77LE58_07 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77LE58-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77LE58F-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
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