Renesas M16C Series User Manual

Timer A
M30240 Group
Rev.1.00 Sep 24, 2003 Page 72 of 360
Figure 1.65: Timer Ai mode register in event counter mode, two-phase signal
Note 1: The settings of the corresponding port register and port direction register are invalid.
Note 2: This bit is valid when only counting an external signal.
Note 3: Set the corresponding port direction register to “0”.
Note 4: This bit is valid for the Timer
A3 mode register.
For Timer A2 and A4 mode registers, this bit can be “0 ”or “1”.
Note 5: When performing two-phase pulse signal processing, make sure the two-phase pulse
signal processing operation select bit (address 0384
16) is set to “1”. Also, always be
sure to set the event/trigger select bit (addresses 0382
16 and 038316) to “00”.
Note 6: This value can be indeterminate when the count starts.
Timer Ai mode register
(When not using two-phase pulse signal processing)
Symbol
Address
When reset
TAiMR(i = 2 to 4)
0398
16 to 039A16
0016
b7 b6 b5 b4 b3 b2 b1 b0
Operation mode select bit
0 1 : Event counter mode
b1 b0
TMOD1
TMOD0
MR0
Pulse output function
select bit
0 : Pulse is not output
(TAi
OUT pin is a normal port pin)
1 : Pulse is output (Note 1)
(TAi
OUT pin is a pulse output pin)
Count polarity
select bit (Note 2)
MR2
MR1
MR3
0 : (Must always be “0” in event counter mode)
TCK1
TCK0
010
0 : Counts external signal's falling edges
1 : Counts external signal's rising edges
Up/down switching
cause select bit
0 : Up/down flag's content
1 : TA
iOUT pin's input signal (Note 3)
Bit symbol Bit name Function
WR
Count operation type
select bit
Two-phase pulse signal
processing operation
select bit (Note 4)(Note 5)
0 : Reload type
1 : Free-run type (Note 6)
0 : Normal processing operation
1 : Multiply-by-4 processing operation
Note 1: This bit is valid for Timer A3 mode register.
For Timer A2 and A4 mode registers, this bit can be “0” or “1”.
Note 2: When performing two-phase pulse signal processing, make sure the two-phase pulse
signal processing operation select bit (address 0384
16) is set to “1”. Also, always be
sure to set the event/trigger select bit (addresses 0382
16 and 038316
)
to “00”.
Note 3: This value can be indeterminate when the count starts.
Timer Ai mode register
(When using two-phase pulse signal processing)
Symbol Address
When reset
TAiMR(i = 2 to 4) 0398
16 to 039A16
0016
b7 b6 b5 b4 b3 b2 b1 b0
Operation mode select bit
0 1 : Event counter mode
b1 b0
TMOD1
TMOD0
MR0
0 (Must always be “0” when using two-phase pulse signal
processing)
0 (Must always be “0” when using two-phase pulse signal
processing)
MR2
MR1
MR3
0 (Must always be “0” when using two-phase pulse signal
processing)
TCK1
TCK0
010
1 (Must always be “1” when using two-phase pulse signal
processing)
Bit symbol Bit name Function
WR
Count operation type
select bit
Two-phase pulse
processing operation
select bit (Note 1)(Note 2)
0 : Reload type
1 : Free-run type (Note 3)
0 : Normal processing operation
1 : Multiply-by-4 processing operation
001

Renesas M16C Series Specifications

General

Brand	Renesas
Model	M16C Series
Category	Computer Hardware
Language	English