Panasonic MN101C77C, F77G user manual Prescaler

Chapter 5 Prescaler

5-1 Overview

This LSI has 2 prescalers that can be used by its peripheral functions at the same time. Each of them count with fosc or fs as a base clock. Its hardware is constructed as follows ;

Prescaler 0	(fosc count)	7 bit prescaler
Prescaler 1	(fs count)	3 bit prescaler

Prescaler 0 outputs fosc/2, fosc/4, fosc/16, fosc/32, fosc/64, fosc/128 as cycle clock. Prescaler 1 outputs fs/2, fs/4, fs/8 as cycle clock. Prescaler is used when cycle clock based fosc and fs is used on the following peripheral functions ;

External interrupt 0 interface (with noise filter)

External interrupt 1 interface (with noise filter)

Timer 0 (8-Bit timer counter)

Timer 1 (8-Bit timer counter)

Timer 4 (8-Bit timer counter)

Timer 5 (8-Bit timer counter)

Serial interface 0 (Clock synchronous / Duplex UART)

Serial interface 1 (Clock synchronous / Half-duplex UART)

Serial interface 3 (Clock synchronous / Single master IIC)

About fosc, fs, refer to chapter 2. 2-5 Clock Switching [p.II-32].

V - 2 Overview