参数资料
型号: mPD789322
厂商: NEC Corp.
元件分类: 8位微控制器
英文描述: 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述: 8位微控制器与2/4/8K字节在系统可编程闪存
文件页数: 19/96页
文件大小: 482K
代理商: MPD789322
Preliminary Product Information U14673EJ1V0PM00
26
PD789322,789324,789326,789327
5.2 Clock Generator
5.2.1 Clock generator function
The clock generator generates the clock pulse to be supplied to the CPU and peripheral hardware.
There are two types of system clock oscillators:
Main system clock oscillator (ceramic/crystal resonator)
This circuit generates a frequency of 1.0 to 5.0 MHz.
Oscillation can be stopped by executing the STOP
instruction or by means of a processor clock control register (PCC) setting.
Subsystem clock oscillator
This circuit generates a frequency of 32.768 kHz. Oscillation can be stopped using the subclock oscillation
mode register (SCKM).
5.2.2 Clock generator configuration
The clock generator consists of the following hardware.
Table 5-4. Clock Generator Configuration
Item
Configuration
Control registers
Processor clock control register (PCC)
Subclock oscillation mode register (SCKM)
Subclock control register (CSS)
Oscillators
Main system clock oscillator
Subsystem clock oscillator
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