參數(shù)資料
型號: μPD753036
廠商: NEC Corp.
英文描述: 4 Bit Single Chip Microcontrollers(4位單片微控制器)
中文描述: 4位單片微控制器(4位單片微控制器)
文件頁數(shù): 26/84頁
文件大?。?/td> 596K
代理商: ΜPD753036
26
μ
PD753036
6.6 Watch Timer
The
μ
PD753036 has one channel of watch timer. The functions of the watch timer are as follows:
Sets the test flag (IRQM) with 0.5 sec interval. The standby mode can be released by the IRQM.
0.5 sec interval can be created by both the main system clock (4.194304 MHz) and subsystem clock (32.768
kHz).
Convenient for program debugging and checking as interval becomes 128 times shorter (3.91 ms) with the
fast feed mode.
Outputs the frequencies (2.048, 4.096, 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 6-5. 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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