參數(shù)資料
型號(hào)： UPD753304W
廠商： NEC Corp.
元件分類： 4位微控制器
英文描述： 4-BIT SINGLE-CHIP MICROCONTROLLER FOR SMALL GENERAL-PURPOSE INFRARED REMOTE CONTROL TRANSMITTER
中文描述： 4位單片機(jī)的小型通用紅外遙控器
文件頁數(shù)： 22/56頁
文件大?。?/td> 374K
代理商： UPD753304W
22
μ
PD753304
6.5 Watch Timer
The
μ
PD753304 has one watch timer channel which has the following functions.
Sets the test flag (IRQW) at f
W
/2
14
intervals. The standby mode can be released by the IRQW.
Convenient for program debugging and checking as interval becomes 128 times longer (f
W
/2
7
) with the fast
feed mode.
Outputs the frequencies (f
W
, f
W
/2
3
, f
W
/2
4
) to the BUZ/P31 pin, usable for buzzer and trimming of system clock
frequencies.
Clears the frequency divider to make the watch start with zero seconds.
Figure 6-4. Watch Timer Block Diagram
From
clock
generator
Selector
f
CC
128
f
CT
f
W
Divider
4 kHz 2 kHz
f
W
2
3
f
W
2
4
Clear
Selector
f
W
2
7
f
W
2
6
f
W
2
14
Selector
IRQW
set signal
INTW
f
LCD
Output buffer
PMGA bit 1
PORT3.1
WM
WM7
0
WM5
WM4
WM3 WM2
WM1
WM0
P31
output-latch
Port 3 input/
output mode
8
Internal bus
BUZ/P31
Note
Note
Set WM2 to 1 when using the LCD controller/driver.
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