M16C30L Datasheet, PDF (79/166 Pages) Renesas Technology Corp – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Timer A
Mitsubishi microcomputers
M16C / 30L Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Timer Ai register (Note 1)
(b15)
b7
(b8)
b0 b7
b0
Symbol
TA0
TA1
TA2
Address
038716,038616
038916,038816
038B16,038A16
When reset
Indeterminate
Indeterminate
Indeterminate
Function
• Timer mode
Counts an internal count source
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
Counts a one shot width
000016 to FFFF16
(Note 2,4)
• Pulse width modulation mode (16-bit PWM)
Functions as a 16-bit pulse width modulator
000016 to FFFE16
(Note 3,4)
• 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
(High-order address)
0016 to FF16
(Low-order address)
(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.
Count start flag
b7 b6 b5 b4 b3 b2 b1 b0
0 00
Symbol
TABSR
Address
038016
When reset
0016
Bit symbol
TA0S
TA1S
TA2S
Bit name
Timer A0 count start flag
Timer A1 count start flag
Timer A2 count start flag
Function
0 : Stops counting
1 : Starts counting
RW
Reserved bit
Must always be set to “0”
TB1S
TB2S
Timer B1 count start flag
Timer B2 count start flag
0 : Stops counting
1 : Starts counting
Up/down flag (Note 1)
b7 b6 b5 b4 b3 b2 b1 b0
00
00
Symbol
UDF
Address
038416
When reset
0016
Bit symbol
Bit name
TA0UD Timer A0 up/down flag
TA1UD Timer A1 up/down flag
TA2UD Timer A2 up/down flag
Function
0 : Down count
1 : Up count
This specification becomes valid
when the up/down flag content is
selected for up/down switching
cause
RW
Reserved bit
Must always be set to “0”
TA2P
0 : two-phase pulse signal
Timer A2 two-phase pulse
processing disabled
signal processing select bit ^{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”
Reserved bit
Must always be set 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”.
Figure 1.14.5. Timer A-related registers (2)
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