參數(shù)資料
型號: UPD78323GJ-5BJ
廠商: NEC Corp.
英文描述: 16/8-BIT SINGLE-CHIP MICROCONTROLLER
中文描述: 16/8-BIT單片機(jī)
文件頁數(shù): 32/86頁
文件大?。?/td> 454K
代理商: UPD78323GJ-5BJ
32
μ
PD78323, 78324
3.6
CLOCK GENERATOR
The clock generator generates and controls internal system clocks (CLK) supplied to the CPU. It is configured as shown
in Figure 3-1.
Figure 3-1. Block Diagram of Clock Generator
X1
X2
STOP Mode
f
XX
or f
X
1/2
f
CLK
Internal System
Clock (CLK)
Divider
System
Clock
Generator
Remarks
1.
2.
3.
f
XX
: Crystal oscillator frequency
f
X
: External clock frequency
f
CLK
: Internal system clock frequency
The system clock oscillator oscillates by a crystal resonator connected to X1 and X2 pins. It stops oscillating when set
to the standby mode (STOP).
External clocks can be input to the system clock oscillator. In such cases, input a clock signal to the X1 pin and input
the reverse phase of the clock signal to the X2 pin. The X2 pin can also be left open.
Caution When using external clocks, do not set the STBC STP bit.
The divider generates internal system clocks (f
CLK
) by dividing a system clock oscillator output (fxx for crystal oscillation
and fx for external clocks) into two parts.
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