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Chapter 5 Prescaler
V - 2
Overview
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].