Renesas R8C/18 Series Hardware Manual page 120

R8C/18 Group, R8C/19 Group
Prescaler X Register
b7 b0
Timer X Register
b7 b0
Timer Count Source Setting Register
b7 b6 b5 b4 b3 b2 b1 b0
0 0 0 0
NOTE:
1. Do not sw itch count sources during a count operation. Stop the timer count before sw itching count sources.
Figure 14.3 Registers PREX, TX, and TCSS
Rev.1.30 Apr 14, 2006
REJ09B0222-0130
Symbol
PREX
Mode
Timer mode Counts internal count source.
Pulse output mode Counts internal count source.
Counts input pulses from external clock.
Event counter mode
Pulse w idth Measures pulse w idth of input pulses from
measurement mode external clock (counts internal count source).
Pulse period Measures pulse period of input pulses from
measurement mode external clock (counts internal count source).
Symbol
TX
Counts underflow of prescaler X
Symbol Address
008Eh
TCSS
Bit Symbol Bit Name
Timer X count source select
TXCK0
(1)
bits
TXCK1
— Reserved bits
(b3-b2)
Timer Z count source select
TZCK0
(1)
bits
TZCK1
— Reserved bits
(b7-b6)
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Address
008Ch
Function
Address
008Dh
Function
b1 b0
0 0 : f1
0 1 : f8
1 0 : fRING
1 1 : f2
Set to 0.
b5 b4
0 0 : f1
0 1 : f8
1 0 : Selects timer X underflow .
1 1 : f2
Set to 0.
After Reset
FFh
Setting Range
00h to FFh
00h to FFh
00h to FFh
00h to FFh
00h to FFh
After Reset
FFh
Setting Range
00h to FFh
After Reset
00h
Function
14. Timers
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW