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參數(shù)資料
| 型號： | UPD753012GK |
| 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位單片機的小型通用紅外遙控器 |
| 文件頁數(shù)： | 26/80頁 |
| 文件大?。?/td> | 569K |
| 代理商： | UPD753012GK |
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26
μ
PD753012, 753016, 753017
6.6 Watch Timer
The
μ
PD753017 has one channel of watch timer. The watch timer has the following functions.
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 by both the main system clock and subsystem clock. Take f
X
= 4.194304
MHz for the main system clock frequency and f
XT
= 32.768 kHz for the subsystem clock.
Convenient for program debugging and checking as interval becomes 128 times longer (3.91 ms) with the
fast feed mode.
Outputs the frequencies (2.048, 4.096, 32.768 kHz) to the P23 and BUZ pins, usable for buzzer and trimming
of system clock frequencies.
Clears the frequency divider to make the clock start with zero seconds.
Figure 6-5. Watch Timer Block Diagram
From
clock
generator
Selector
f
X
128
(32.768 kHz)
f
XT
(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
Bit test instruction
P23/BUZ
The values enclosed in parentheses are applied when f
X
= 4.194304 MHz and f
XT
= 32.768 kHz.
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