M16C Datasheet, PDF (89/262 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timer A
Preliminary Specifications REV.B
Mitsubishi microcomputers
Specifications in this manual are tentative and subject to change.
M16C / 6N Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer Ai mode register
(When not using two-phase pulse signal processing)
b7 b6 b5 b4 b3 b2 b1 b0
0
01
Symbol
Address
When reset
TAiMR(i = 2 to 4) 039816 to 039A16 0016
Bit symbol
Bit name
Function
RW
TMOD0
TMOD1
Operation mode select bit ^{b1 b0}
0 1 : Event counter mode
MR0
Pulse output function
select bit
MR1
Count polarity
select bit (Note 2)
0 : Pulse is not output
(TAiOUT pin is a normal port pin)
1 : Pulse is output (Note 1)
(TAiOUT pin is a pulse output pin)
0 : Counts external signal's falling edges
1 : Counts external signal's rising edges
MR2
Up/down switching
cause select bit
0 : Up/down flag's content
1 : TAiOUT pin's input signal (Note 3)
MR3
0 : (Must always be “0” in event counter mode)
TCK0
TCK1
Count operation type
select bit
Two-phase pulse signal
processing operation
select bit (Note 4)(Note 5)
0 : Reload type
1 : Free-run type
0 : Normal processing operation
1 : Multiply-by-4 processing operation
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 038416) is set to “1”. Also, always be
sure to set the event/trigger select bit (addresses 038216 and 038316) to “00”.
Timer Ai mode register
(When using two-phase pulse signal processing)
b7 b6 b5 b4 b3 b2 b1 b0
0 1 0 00 1
Symbol
Address
When reset
TAiMR(i = 2 to 4) 039816 to 039A16 0016
Bit symbol
Bit name
Function
RW
TMOD0
TMOD1
Operation mode select bit ^{b1 b0}
0 1 : Event counter mode
MR0
MR1
MR2
MR3
0 (Must always be “0” when using two-phase pulse signal
processing)
0 (Must always be “0” when using two-phase pulse signal
processing)
1 (Must always be “1” when using two-phase pulse signal
processing)
0 (Must always be “0” when using two-phase pulse signal
processing)
TCK0
Count operation type
select bit
0 : Reload type
1 : Free-run type
TCK1
Two-phase pulse
processing operation
0 : Normal processing operation
select bit (Note 1)(Note 2) ^{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 038416) is set to “1”. Also, always be
sure to set the event/trigger select bit (addresses 038216 and 038316) to “00”.
Figure 9-9. Timer Ai mode register in event counter mode
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