Mitsubishi microcomputers
M16C / 61 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer A
Timer Ai register (Note)
Symbol
TA0
TA1
TA2
TA3
Address
When reset
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate
(b15)
(b8)
b0 b7
038716,038616
038916,038816
038B16,038A16
038D16,038C16
038F16,038E16
b7
b0
TA4
Values that can be set
000016 to FFFF16
Function
R W
• Timer mode
Counts an internal count source
• Event counter mode
Counts pulses from an external source or timer overflow
000016 to FFFF16
000016 to FFFF16
• One-shot timer mode
Counts a one shot width
• Pulse width modulation mode (16-bit PWM)
Functions as a 16-bit pulse width modulator
000016 to FFFE16
• Pulse width modulation mode (8-bit PWM)
Timer low-order address functions as an 8-bit
prescaler and high-order address functions as an 8-bit
pulse width modulator
0016 to FE16
(Both high-order
and low-order
addresses)
Note: Read and write data in 16-bit units.
Count start flag
Symbol
TABSR
Address
038016
When reset
0016
b7 b6 b5 b4 b3 b2 b1 b0
Bit symbol
TA0S
TA1S
TA2S
TA3S
TA4S
TB0S
TB1S
TB2S
Bit name
Function
R W
Timer A0 count start flag
Timer A1 count start flag
Timer A2 count start flag
Timer A3 count start flag
Timer A4 count start flag
Timer B0 count start flag
Timer B1 count start flag
Timer B2 count start flag
0 : Stops counting
1 : Starts counting
Up/down flag
Symbol
UDF
Address
038416
When reset
0016
b7 b6 b5 b4 b3 b2 b1 b0
R W
Bit symbol
TA0UD
Bit name
Function
Timer A0 up/down flag
0 : Down count
1 : Up count
TA1UD
TA2UD
TA3UD
TA4UD
TA2P
Timer A1 up/down flag
Timer A2 up/down flag
This specification becomes valid
when the up/down flag content is
selected for up/down switching
cause
Timer A3 up/down flag
Timer A4 up/down flag
0 : two-phase pulse signal
processing disabled
1 : two-phase pulse signal
processing enabled
Timer A2 two-phase pulse
signal processing select bit
TA3P
TA4P
Timer A3 two-phase pulse
signal processing select bit
When not using the two-phase
pulse signal processing function,
set the select bit to “0”
Timer A4 two-phase pulse
signal processing select bit
Figure 1.16.4. Timer A-related registers (2)
72
MITSUBISHI [ Mitsubishi Group ]
