Renesas R8C series User Manual

R8C/1A Group, R8C/1B Group 14. Timers
Rev.1.30 Dec 08, 2006 Page 111 of 315
REJ09B0252-0130
Figure 14.3 Registers PREX, TX, and TCSS
Prescaler X Register
Symbol Address After Reset
PREX
008Ch FFh
Mode Function Setting Range RW
Measures pulse w idth of input pulses from
external clock (counts internal count
source).
00h to FFh RW
Pulse period
measurement mode
Measures pulse period of input pulses from
external clock (counts internal count
source).
00h to FFh RW
Pulse w idth
measurement mode
b0b7
Timer mode RWCounts internal count source. 00h to FFh
Pulse output mode RWCounts internal count source. 00h to FFh
Event counter mode
Counts input pulses from external clock.
00h to FFh RW
Timer X Register
Symbol Address After Reset
TX
008Dh FFh
Setting Range RW
RW00h to FFh
Function
Counts underflow of prescaler X
b7 b0
Timer Count Source Setting Register
Symbol Address After Reset
TCSS
008Eh 00h
Bit Symbol Bit Name Function RW
NOTE :
1.
b3 b2 b1 b0
00
TXCK0 RW
b7 b6 b5 b4
00
TXCK1 RW
Timer X count source select
bits
(1)
b1 b0
0 0 : f1
0 1 : f8
1 0 : fRING
1 1 : f2
Reserved bits—
(b3-b2)
RW
RW
Set to 0.
TZCK1 RW
Timer Z count source select
bits
(1)
b5 b4
0 0 : f1
0 1 : f8
1 0 : Selects timer X underflow .
1 1 : f2
TZCK0
Do not sw itch count sources during a count operation. Stop the timer count before sw itching count
sources.
—
(b7-b6)
Reserved bits Set to 0.
RW

Renesas R8C series Specifications

General

Brand	Renesas
Model	R8C series
Category	Computer Hardware
Language	English