M16CSLASH1N datasheet(97/238 Pages) RENESAS

97 / 238 page

Rev.1.00

Oct 20, 2004

page 85 of 222

M16C/1N Group

12. Timers

REJ09B0007-0100Z

Table 12.8 Specifications of timer mode

(n+1) X (m+1)

Note 1: When the count is stopped, the Timer Y interrupt request bit becomes "1" and an interrupt may occur. Thus,

interrupts must be disabled before the count is stopped. Furthermore, set the Timer Y interrupt request bit to "0"

before starting counting again.

Note 2: If writing to the Timer Y or prescaler Y under the following conditions being filled at the same time the Timer Y

interrupt request bit becomes "1" and an interrupt occurs.

• Timer Y write control bit (bit 2 at address 008016) is "0" (write to timer and reload register simultaneously)

• Timer Y count start flag (bit 3 at address 008016) is "1" (count start)

To write to the Timer Y or prescaler Y in the above state, disable interrupts before writing.

Item

Specification

Count source

f1, f8, on-chip oscillator output, fC32

Count operation

• Down count

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

counting (When the Timer Y underflows, the contents of the Timer Y primary reload

• When a counting stops, the timer reloads the content of the reload register before it

stops.

Divide ratio

n: Set value of Prescaler Y, m: Set value of Timer Y primary

Count start condition

Count start flag is set (=1)

Count stop condition

Count start flag is reset (=0) (Note 1)

Interrupt request generation timing When Timer Y underflows

TYOUT pin function

Programmable I/O port

Read from timer

Count value can be read out by reading Timer Y primary register.

Same applies to Prescaler Y register.

Write to timer

When a value is written to Timer Y Primary register, it is written to both reload register

and counter or written to only reload register. Selected by software.

Same applies to Prescaler Y register.

Select function

• Timer Y write control function (Note 2)

When a value is written to Timer Y Primary register, it can be selected that the value is

written to both reload register and counter or written to only reload register.

Same applies to Prescaler Z register.

12.3.1 Timer Mode

In this mode, the timer counts an internally generated count source.

(See Table 12.8) The Timer Y secondary is unused in this mode. Figure 12.17 shows the Timer Y, Z

mode register and Timer Y, Z waveform output control register in timer mode.

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