參數(shù)資料
型號(hào)： UPD75316B
廠商： NEC Corp.
英文描述： 4-BIT SINGLE-CHIP MICROCOMPUTER
中文描述： 4位單片機(jī)
文件頁(yè)數(shù)： 21/77頁(yè)
文件大小： 587K
代理商： UPD75316B
21
μ
PD75312B, 75316B
5.5
WATCH TIMER
The
μ
PD75316B incorporates a watch timer channel. The watch timer has the following functions.
Sets test flags (IRQW) at 0.5-second intervals.
The standby mode can be released with IRQW.
0.5-second time intervals can be created in either the main system clock or the subsystem clock.
In the rapid feed mode, time intervals which are 128 times normal (3.91 ms) can be set, making this
function convenient for program debugging and testing.
A fixed frequency (2.048 kHz) can be output to the P23/BUZ pin for use in generating buzzer sounds and
trimming system clock oscillator frequencies.
The frequency divider can be cleared, enabling creation of watches that can start from 0 second.
Fig. 5-4 Watch Timer Block Diagram
Remark
Values in parentheses are when f
X
= 4.194304 MHz and f
XT
= 32.768 kHz.
8
Internal Bus
WM7
0
0
0
WM3 WM2 WM1 WM0
Bit Test Instruction
P23
Output
Latch
Port 2
Input/Output
Mode
PORT2.3
Bit 2 of PMGB
P23/BUZ
Output Buffer
Selector
Frequency Divider
Clear
(2.048 kHz)
f
LCD
2
14
f
W
2
6
f
W
(512 Hz : 1.95 ms)
2
7
f
W
(256 Hz : 3.91 ms)
f
W
(32.768 kHz)
Selector
WM
From
Clock
Generator
16
f
W
128
(32.768 kHz)
f
X
f
XT
(32.768 kHz)
INTW
IRQW Set
Signal
2Hz
0.5 sec
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