參數(shù)資料
型號: UPD75036
廠商: NEC Corp.
英文描述: 4 BIT SINGLE-CHIP MICROCOMPUTER
中文描述: 4位單片機(jī)
文件頁數(shù): 21/58頁
文件大?。?/td> 485K
代理商: UPD75036
21
μ
PD75036
5.5 CLOCK TIMER
The
μ
PD75036 contains one channel for a clock timer. The clock timer provides the following functions:
The clock timer sets the test flag (IRQW) every 0.5 seconds.
The standby mode can be released with IRQW.
Either the main system clock or subsystem clock can produce 0.5-second intervals.
The fast-forward mode produces an interval 128 times faster (3.91 ms), which is useful for program debugging
and testing.
An arbitrary frequency (2.048, 4.096, or 32.768 kHz) can be output to the P23/BUZ pin, so that it can be used
for sounding the buzzer and system clock frequency trimming.
The frequency divider can be cleared, so the clock can start from zero seconds.
Fig. 5-4 Block Diagram of the Clock Timer
The values in parentheses indicates are for f
X
= 4.194304 MHz and f
XT
= 32.768 kHz
P23/BUZ
Internal bus
8
Selector
Fro 128
the
clock
gener-
ator
X
(32.768 kHz)
f
XT
(32.768 kHz)
Selector
Frequency divider
Selector
INTW
IRQW
set signal
2 Hz
0.5 sec
WM7
WM6
WM5
WM4
WM3
WM2
WM1
WM0
P23 output
latch
Bit 2 of PMGB
PORT2.3
Output buffer
Clear signal
f
W
(32.768 kHz)
Bit test instruction
Port 2 input/
output mode
WM
4 kHz 2 kHz
f
W
2
7
(256 Hz: 3.91 ms)
f
W
2
14
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