參數(shù)資料
型號(hào): UPD753204
廠商: NEC Corp.
英文描述: 4-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 4位單晶片微控制器
文件頁數(shù): 25/80頁
文件大?。?/td> 577K
代理商: UPD753204
25
μ
PD753204, 753206, 753208
6.5 Watch Timer
The
μ
PD753208 has one watch timer channel, whose functions are as follows.
Sets the test flag (IRQW) with 0.5 sec interval. The standby mode can be released by the IRQW.
0.5 sec interval can be created with the system clock (4.194304 MHz)
Convenient for program debugging and checking as interval becomes 128 times longer (3.91 ms) with the
fast feed mode.
Outputs a frequency (2.048, 4.096, or 32.768 kHz) to the BUZ pin (P23), usable for buzzer and trimming
of system clock frequencies.
Clears the frequency divider to make the clock start with zero seconds.
Figure 6-4. Watch Timer Block Diagram
From
clock
generator
Selector
f
X
128
(32.768 kHz)
f
W
(32.768 kHz)
Divider
4 kHz 2 kHz
f
W
2
3
f
W
2
4
Clear
Selector
f
W
2
7
f
W
2
6
(512 Hz : 1.95 ms)
(256 Hz : 3.91 ms)
f
W
2
14
Selector
2 Hz
0.5 sec
IRQW
set signal
INTW
f
LCD
Output buffer
PMGB bit 2
PORT2.3
WM
WM7
0
WM5
WM4
WM3
WM2
WM1
WM0
P23
output-latch
Port 2 input/
output mode
8
Internal bus
P23/BUZ
Note 2
Note 1
Notes 1.
WM3 is undefined while reading data.
2.
Be sure to set WM0 to 0.
Remark
The values enclosed in parentheses are applied when f
X
= 4.194304 MHz.
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