R8C/13 Group
12.1 Timer (Timer X)
Prescaler X Register
b7
Symbol
PREX
Address
008C16
After reset
b0
FF16
Mode
Function
Setting range
0016 to FF16
RW
RW
Internal count source is counted
Internal count source is counted
Externally input pulses are counted
Timer mode
Pulse output mode
Event counter mode
0016 to FF16
0016 to FF16
RW
RW
Pulse width of externally input
pulses is measured
(Internal count source is counted)
Pulse width
measurement mode
0016 to FF16
0016 to FF16
RW
RW
Pulse period of externally input
pulses is measured
Pulse period
measurement mode
(Internal count source is counted)
Timer X Register
b7
b0
Symbol
TX
Address
008D16
After reset
FF16
Function
Underflow of Prescaler X is counted
Setting range
0016 to FF16
RW
RW
Timer count source setting register
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
TCSS
Address
008E16
After reset
0016
0
0
RW
RW
Bit symbol
TXCK0
Bit name
Function
b1 b0
Timer X count source
select bit(1)
0 0 : f
0 1 : f
1
8
1 0 : f32
TXCK1
TYCK0
RW
RW
RW
RW
RW
RW
1 1 : f
2
b3 b2
Timer Y count source
select bit(1)
0 0 : f
0 1 : f
1
8
1 0 : fRING
1 1 : Selects input from CNTR
TYCK1
TZCK0
1
pin
b5 b4
Timer Z count source
select bit(1)
0 0 : f
0 1 : f
1
8
1 0 : Selects Timer Y underflow
1 1 : f
TZCK1
(b7-b6)
2
Reserved bit
Must be set to “0”
NOTES:
1. Avoid switching a count source, while a counter is in progress. Timer counter must be stopped before switching a count
source.
Figure 12.3 PREX Register, TX Register, and TCSS Register
Rev.1.20 Jan 27, 2006 page 72 of 205
REJ09B0111-0120
RENESAS [ RENESAS TECHNOLOGY CORP ]
