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參數(shù)資料
| 型號： | μPD784225Y |
| 廠商： | NEC Corp. |
| 英文描述： | 16 Bit Single Chip Microcontrollers(16 位單片微控制器) |
| 中文描述： | 16位單片機微控制器（16位單片微控制器） |
| 文件頁數(shù)： | 42/68頁 |
| 文件大?。?/td> | 278K |
| 代理商： | ΜPD784225Y |
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42
μ
PD784224Y, 784225Y
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 control circuit
BUZ
S
7.10 Edge Detection Function
The interrupt input pins (INTP0, INTP1, NMI/INTP2, INTP3 through 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 through 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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