參數(shù)資料
型號(hào): W925E240
英文描述: Telephone Controller
中文描述: 電話控制器
文件頁(yè)數(shù): 38/66頁(yè)
文件大?。?/td> 930K
代理商: W925E240
W925E/C240
8-bit CID Microcontroller
Revision : A6
-38-
Release Date : 2002/7/2
to 0000h. The timer overflow flag TFx of the relevant timer is set and if enabled an interrupts will
occur. Note that when they are used as a timer, the bits of the CKCON1 select the time-base.
MODE1
Mode 1 is similar to Mode 0 except that the counting register forms a 16-bit counter, rather than a
13 bit counter.
C/T = TMOD.2
(C/T = TMOD.6)
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)
PS: Functions of timer1 are shown in brackets
7
0
TFx
4
7
0
00
1
01
0
TM0=CKCON1.2, CKCON1.3
(TM1=CKCON1.4, CKCON1.5)
mux
00
01
10
11
Fosc/4
Fosc/64
Fosc/1024
Fs
Figure 6-5 Mode 0 & Mode 1 of Timer/Counter 0 & 1
MODE 2
Mode 2 is the Auto Reload Mode. In mode 2, TLx acts as an 8-bit count register, while THx holds
the reload value. When the TLx register overflows from FFh to 00h, the TFx bit is set and TLx is
reloaded with the content of THx, and the counting process continues from the reloaded TLx. The
reload operation leaves the content of the THx register unchanged. Counting is controlled by the
TRx bit and the proper setting of GATE and INTx pins.
BUZZER
In mode 2, timer 0 can be use to output an arbitrary frequency to the BUZ pin by programming
bit6 and bit7 of CKCON2. BUZ pin can be configured as key tone (KT) output by setting BUZSL
to high. When disable buzzer output by clearing ENBUZ to low, the BUZ output is in floating
status.
In the case where timer 0 clock input is FT, the desired frequency for BUZ output = FT / (255 –
preset value + 1) / 2 (HZ).
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