參數(shù)資料
型號(hào)： UPD784225Y
廠商： NEC Corp.
英文描述： 16/8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述： 16/8-BIT單晶片微控制器
文件頁(yè)數(shù)： 44/92頁(yè)
文件大小： 687K
代理商： UPD784225Y
44
μ
PD784224, 784225, 784224Y, 784225Y
Data Sheet U12376EJ1V0DS00
7.9 Buzzer Output Function
Clocks of the following frequencies can be output as buzzer output.
1.5 kHz/3.1 kHz/6.1 kHz/12.2 kHz (main system clock: 12.5 MHz)
Figure 7-15. Block Diagram of Buzzer Output Function
f
XX
/2
10
f
XX
/2
11
f
XX
/2
12
f
XX
/2
13
Output controller
BUZ
S
7.10 Edge Detection Function
The interrupt input pins (INTP0, INTP1, NMI/INTP2, INTP3 to INTP5) are used not only to input interrupt requests
but also to input trigger signals to the internal hardware units. Because these pins operate at an edge of the input
signal, they have a function to detect an edge. Moreover, a noise reduction circuit is also provided to prevent
erroneous detection due to noise.
Pin Name
Detectable Edge
Noise Reduction
NMI
Either or both of rising and falling edges
By analog delay
INTP0 to INTP5
—
7.11 Watch Timer
The watch timer has the following functions:
Watch timer
Interval timer
The watch timer and interval timer functions can be used at the same time.
(1) Watch timer
The watch timer sets the WTIF flag of the interrupt control register (WTIC) at time intervals of 0.5 seconds
by using the 32.768-kHz subsystem clock.
(2) Interval timer
The interval timer generates an interrupt request (INTTM3) at predetermined time intervals.
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