M16CSLASH1N datasheet(83/238 Pages) RENESAS

83 / 238 page

Rev.1.00

Oct 20, 2004

page 71 of 222

M16C/1N Group

12. Timers

REJ09B0007-0100Z

Item

Specification

Count source

f1, f8, f32, fC32

Count operation

• Down count

• When the timer underflows, it reloads the reload register contents before continuing

counting

Divide ratio

n: Set value of Prescaler 1, m: Set value of Timer 1

Count start condition

After reset

Count stop condition

Disable to stop counting

Interrupt request generation timing When Timer 1 underflows

Read from timer

Count value can be read out by reading Timer 1 register.

Same applies to Prescaler 1 register.

Write to timer

When a value is written to Timer 1 register, it is written to both reload register and

counter.

Same applies to Prescaler 1 register.

Clock source

selection

f32

fC32

Prescaler 1 (address 008816)

Peripheral data bus

Reload register (8)

Counter (8)

Reload register (8)

Counter (8)

Timer 1 (address 008916)

Timer 1 interrupt

request bit

fP1

(n+1) X (m+1)

12.1 Timer 1

Timer 1 is an 8-bit timer with an 8-bit prescaler. Figure 12.1 shows the block diagram of Timer 1. The timer

constantly counts an internally generated count source (clock source). The count source after reset is set

to f1. The timer cannot stop counting. Table 12.2 shows the specifications of Timer 1 and Figure 12.2

shows Timer 1 related registers.

Figure 12.1 Block diagram of Timer 1

Table 12.2 Specifications of Timer 1 (Timer mode)

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