M16C80 Datasheet, PDF (106/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

M16C/80 Group
13. Timer A
Timer Ai register (Note 1)
(b15)
b7
(b8)
b0b7
Symbol
b0
TA0
TA1
TA2
TA3
TA4
Function
• Timer mode
Counts an internal count source
Address
034716,034616
034916,034816
034B16,034A16
034D16,034C16
034F16,034E16
When reset
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Indeterminate
Values that can be set R W
000016 to FFFF16
• Event counter mode
000016 to FFFF16
Counts pulses from an external source or timer overflow
• One-shot timer mode (Note 2, 3)
Counts a one shot width
000016 to FFFF16
• Pulse width modulation mode (16-bit PWM) (Note 2, 4) _{000016 to FFFE16}
Functions as a 16-bit pulse width modulator
• Pulse width modulation mode (8-bit PWM) (Note 2, 4)
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
(High-order address)
0016 to FF16
(Low-order address)
Count start flag
Note 1: Read and write data in 16-bit units.
Note 2: Use MOV instruction to write to this register.
Note 3: 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 4: 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".
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
TABSR
Address
034016
When reset
0016
Bit symbol
TA0S
TA1S
TA2S
TA3S
TA4S
TB0S
TB1S
TB2S
Bit name
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
Function
0 : Stops counting
1 : Starts counting
Up/down flag (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
Symbol
UDF
Address
034416
When reset
0016
RW
Bit symbol
Bit name
Function
RW
TA0UD
TA1UD
TA2UD
TA3UD
TA4UD
Timer A0 up/down flag
Timer A1 up/down flag
Timer A2 up/down flag
Timer A3 up/down flag
Timer A4 up/down flag
0 : Down count
1 : Up count
This specification becomes valid
when the up/down flag content is
selected for up/down switching
cause
TA2P
TA3P
TA4P
Timer A2 two-phase pulse
signal processing select bit
Timer A3 two-phase pulse
signal processing select bit
Timer A4 two-phase pulse
signal processing select bit
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 corresponding port function select register A to I/O port,
and port direction register to "0".
Figure 13.3 Timer A-related registers (2)
Rev.1.00 Aug. 02, 2005 ^{Page 95} of 329
REJ09B0187-0100