R8CSLASH15 datasheet(98/277 Pages) RENESAS

98 / 277 page

R8C/14 Group, R8C/15 Group

13. Timers

Rev.2.10

Jan 19, 2006

Page 86 of 253

REJ09B0164-0210

Figure 13.3

PREX, TX and TCSS Registers

Prescaler X Register

Symbol

Address

After Reset

PREX

008Ch

FFh

Mode

Function

Setting Range

Event Counter Mode

Counts input pulses from external

00h to FFh

Pulse Output Mode

Counts internal count source

00h to FFh

Timer Mode

Counts internal count source

00h to FFh

Measures pulse w idth of input pulses from

external (counts internal count source)

00h to FFh

Pulse Period

Measurement Mode

Measures pulse period of input pulses from

external (counts internal count source)

00h to FFh

Pulse Width

Measurement Mode

Timer X Register

Symbol

Address

After Reset

008Dh

FFh

Setting Range

00h to FFh

Function

Counts underflow of Prescaler X

Timer Count Source Setting Register

Symbol

Address

After Reset

TCSS

008Eh

00h

Bit Symbol

Bit Name

Function

NOTES :

b3 b2 b1 b0

TXCK0

b7 b6 b5 b4

TXCK1

Timer X Count Source Select

Bit(1)

b1 b0

0 0 : f1

0 1 : f8

1 0 : fRING

1 1 : f2

Reserved Bit

—

(b3-b2)

Set to “0”

TZCK1

Timer Z Count Source Select

Bit(1)

b5 b4

0 0 : f1

0 1 : f8

1 0 : Selects Timer X underflow

1 1 : f2

TZCK0

Do not sw itch a count source during a count operation. Stop the timer count before sw itching a count

source.

—

(b7-b6)

Reserved Bit

Set to “0”

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