Mitsubishi microcomputers
M16C / 30 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer A
78
Figure 1.14.5. Timer A-related registers (2)
Symbol
Address
When reset
TA0
038716,038616
Indeterminate
TA1
038916,038816
Indeterminate
TA2
038B16,038A16
Indeterminate
b7
b0 b7
b0
(b15)
(b8)
Timer Ai register (Note 1)
W
R
Timer mode
000016 to FFFF16
Counts an internal count source
Function
Values that can be set
Event counter mode
000016 to FFFF16
Counts pulses from an external source or timer overflow
One-shot timer mode
000016 to FFFF16
Counts a one shot width
(Note 2,4)
Pulse width modulation mode (16-bit PWM)
Functions as a 16-bit pulse width modulator
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
000016 to FFFE16
(Note 3,4)
Note 1: Read and write data in 16-bit units.
Note 2: When the timer Ai register is set to “000016”, the counter does not
operate and the timer Ai interrupt request is not generated. When the
pulse is set to output, the pulse does not output from the TAiOUT pin.
Note 3: When the timer Ai register is set to “000016”, the pulse width modulator
does not operate and the output level of the TAiOUT pin remains “L”
level, therefore the timer Ai interrupt request is not generated. This also
occurs in the 8-bit pulse width modulator mode when the significant 8
high-order bits in the timer Ai register are set to “0016”.
Note 4: Use MOV instruction to write to this register.
0016 to FE16
(High-order address)
0016 to FF16
(Low-order address)
(Note 3,4)
Symbol
Address
When reset
TABSR
038016
0016
Count start flag
Bit name
Function
Bit symbol
W
R
b7
b6
b5
b4
b3
b2
b1
b0
Timer B2 count start flag
Timer B1 count start flag
Timer A2 count start flag
Timer A1 count start flag
Timer A0 count start flag
0 : Stops counting
1 : Starts counting
TB2S
TB1S
TA2S
TA1S
TA0S
0 : Stops counting
1 : Starts counting
Reserved bit
Must always be set to “0”
00
0
Timer A2 up/down flag
Timer A1 up/down flag
Timer A0 up/down flag
Timer A2 two-phase pulse
signal processing select bit
Symbol
Address
When reset
UDF
038416
0016
TA2P
Up/down flag (Note 1)
Bit name
Function
Bit symbol
W
R
b7
b6
b5
b4
b3
b2
b1
b0
TA2UD
TA1UD
TA0UD
0 : Down count
1 : Up count
This specification becomes valid
when the up/down flag content is
selected for up/down switching
cause
0 : two-phase pulse signal
processing disabled
1 : two-phase pulse signal
processing enabled (Note 2)
When not using the two-phase
pulse signal processing function,
set the select bit to “0”
Note 1: Use MOV instruction to write to this register.
Note 2: Set the TAiIN and TAiOUT pins correspondent port direction registers to “0”.
00
0
Reserved bit
Must always be set to “0”
Reserved bit
Must always be set to “0”