參數(shù)資料
型號(hào)： UPD784218YGC
廠(chǎng)商： NEC Corp.
英文描述： Cable; Leaded Process Compatible:No; Peak Reflow Compatible (260 C):No
中文描述： 16-/8-bit的單晶片微控制器
文件頁(yè)數(shù)： 44/92頁(yè)
文件大?。?/td> 617K
代理商： UPD784218YGC
μ
PD784218, 784218Y
Data Sheet U12304EJ2V0DS00
44
8.9 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 (@ 12.5 MHz operation with main system clock)
Figure 8-15. 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
8.10 Edge Detection Function
The interrupt input pins (INTP0, INTP1, NMI/INTP2, INTP3 through INTP6) 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 function 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 INTP6
8.11 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
using the 32.768 kHz subsystem clock.
(2) Interval timer
The interval timer generates an interrupt request (INTTM3) at preset time intervals.
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