M16CSLASH1N datasheet(107/238 Pages) RENESAS

107 / 238 page

Rev.1.00

Oct 20, 2004

page 95 of 222

M16C/1N Group

12. Timers

REJ09B0007-0100Z

(n+1) X (m+1)

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

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

before starting counting again.

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

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

• Timer Z write control bit (bit 6 at address 008016) is "0" (write to timer and reload register simultaneously)

• Timer Z count start flag (bit 7 at address 008016) is "1" (count start)

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

Item

Specification

Count source

f1, f8, Timer Y underflow, fC32

Count operation

• Down count

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

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

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

stopping counting.

Divide ratio

n: Set value of Prescaler Z, m: Set value of Timer Z 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 Z underflows

TYOUT pin function

Programmable I/O port

INT0 pin function

Programmable I/O port, or external interrupt input pin

Read from timer

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

Same applies to Prescaler Z register.

Write to timer

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

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

Same applies to Prescaler Z register.

Select function

• Timer Z write control function (Note 2)

When a value is written to Timer Z 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.

12.4.1 Timer Mode

In this mode, the timer counts an internally generated count source or Timer Y underflow. (See Table

12.10) The Timer Z secondary is unused in this mode. Figure 12.25 shows the Timer Y, Z mode

Table 12.10 Specifications of timer mode

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