參數(shù)資料
型號(hào): μPD780021Y
廠商: NEC Corp.
英文描述: 8 Bit Single Chip Microcontrollers(8位單片微控制器)
中文描述: 8位單片機(jī)微控制器(8位單片微控制器)
文件頁數(shù): 23/66頁
文件大小: 453K
代理商: ΜPD780021Y
μ
PD780021Y, 780022Y, 780023Y, 780024Y
Preliminary Data Sheet
23
5.4 Clock Output/Buzzer Output Control Circuit
A clock output/buzzer output control circuit (CKU) is incorporated.
Clocks with the following variation of frequency can be output as a clock output.
65.5 kHz/131 kHz/262 kHz/524 kHz/1.05 MHz/2.10 MHz/4.19 MHz/8.38 MHz (at 8.38-MHz operation with main
system clock)
32.768 kHz (at 32.768-kHz operation with subsystem clock)
Clocks with the following variation of frequency can be output as a buzzer output.
1.02 kHz/2.05 kHz/4.10 kHz/8.19 kHz (at 8.38-MHz operation with main system clock)
Figure 5-7. Block Diagram of Clock Output/Buzzer Output Control Circuit CKU
Prescaler
f
X
f
XT
8
Clock
control
circuit
PCL/P74
BUZ/P75
4
f
X
to f
X
/2
7
f
X
/2
10
to f
X
/2
13
S
BCS0, BCS1
BZOE
CLOE
BZOE
BCS1
BCS0
CLOE
CCS3
CCS2
CCS1
CCS0
Internal bus
Clock output selection register (CKS)
S
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