R8C datasheet(67/199 Pages) RENESAS

67 / 199 page

R8C/10 Group

Rev.1.20 Jan 27, 2006

page 57 of 180

REJ09B0019-0120

Figure 12.3 PREX Register, TX Register, and TCSS Register

Bit name

Function

Bit symbol

Timer X count source

select bit(1)

b1 b0

TXCK1

TXCK0

TYCK0

Timer Y count source

select bit(1)

TZCK0

TYCK1

TZCK1

Must be set to “0”

(b7-b6)

Reserved bit

Timer Z count source

select bit(1)

NOTES:

1. Avoid switching a count source, while a counter is in progress. Timer counter must be stopped before switching a count

source.

Timer count source setting register

SymbolAddressAfter reset

TCSS008E16

0016

b7 b6 b5 b4 b3 b2 b1 b0

0 0 : f1

0 1 : f8

1 0 : f32

1 1 : f2

b3 b2

0 0 : f1

0 1 : f8

1 0 : fRING

1 1 : Selects input from CNTR1 pin

b5 b4

0 0 : f1

0 1 : f8

1 0 : Selects Timer Y underflow

1 1 : f2

Symbol

Address

After reset

008D16

FF16

Underflow of Prescaler X is counted

Function

Timer X Register

Symbol

Address

After reset

PREX

008C16

FF16

Internal count source is counted

Function

Setting range

Prescaler X Register

0016 to FF16

Internal count source is counted

0016 to FF16

Externally input pulses are counted

0016 to FF16

Pulse width of externally input

pulses is measured

(Internal count source is counted)

0016 to FF16

Pulse period of externally input

pulses is measured

(Internal count source is counted)

0016 to FF16

Timer mode

Pulse output mode

Event counter mode

Pulse width

measurement mode

Pulse period

measurement mode

Mode

Setting range

12.1 Timer (Timer X)

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