Panasonic MN101C77C User Manual

Chapter 6 8-bit Timers

VI - 2

Overview

6-1

Overview

This LSI contains two general purpose 8-bit timers (Timers 0 and 1) and two 8-bit timers (Timers 4 and 5)

that can be also used as baud rate timer. The general purpose 8-bit timers can be used as 16-bit timers with

cascade connection.

Fosc or fs can be selected as the clock source for each timer by using the prescaler. Also, remote control

output circuit is built in.

6-1-1

Functions

Table 6-1-1 shows functions of each timer.

Table 6-1-1 Timer Functions

In a cascade connecion, timers 0, 4 and 5 form the "timer 0", or the lower 8 bits of 16-bit counter, and timers

1 form the "timer 1", or the upper 8 bits. Timers 4 and 5 cannot be cascaded.

Timer 0

Timer 1

Timer 4

Timer 5

(8 bit)

Interrupt source

TM0IRQ

TM1IRQ

TM4IRQ

TM5IRQ

Timer operation

Event count

Timer puls e output

PWM output

Synchronous output

Serial transfer clock output

Puls e width meas urement

Cascade connection

Premote control carrier output

Clock s ource

fos c

fos c/4

fos c/16

fos c/32

fos c/64

fos c/32

fos c/64

fos c/128

fos c/64

fs/2

fs/4

fs/8

fs/4

TM0IO input

TM1IO input

TM4IO input

TM5IO input

-When timer 4 and 5 are used as a transfer clock for serial interface 1 function, it is not used
as a general timer.

fos c: Machine clock (High speed oscillation)

fx: Machine clock (Low s peed os cillation)

fs: System clock [ Chapter 2 2.5 Clock Switching]