M16CSLASH26 datasheet(85/239 Pages) RENESAS

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Timer A

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Figure 1.12.5. Timer A-related registers (2)

Symbol

Address

When reset

TA0

038716,038616

Indeterminate

TA1

038916,038816

Indeterminate

TA2

038B16,038A16

Indeterminate

TA3

038D16,038C16

Indeterminate

TA4

038F16,038E16

Indeterminate

b0 b7

(b15)

(b8)

Timer Ai register (Note 1)

· 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

· 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 3,4,6)

(Note 2,6)

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: When the set value =n, PWM period and "H" width of PWM pule are

as follows:

PWM perild: (216 - 1)/ fi, "H" width of PWM pulse: n / fi

Note 5: When the set value of upper-address=n and lower-address=m,

PWM period and "H" width of PWM pule are as follows:

PWM perild: (28 - 1)x(m+1)/ fi, "H" width of PWM pulse: (m+1)n / fi

Note 6: Use MOV instruction to write to this register.

0016 to FE16

(High-order address)

0016 to FF16

(Low-order address)

(Note 3,5,6)

Timer A4 up/down flag

Timer A3 up/down flag

Timer A2 up/down flag

Timer A1 up/down flag

Timer A0 up/down flag

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

Symbol

Address

When reset

UDF

038416

0016

TA4P

TA3P

TA2P

Up/down flag (Note 1)

Bit name

F unction

Bit symbol

TA4UD

TA3UD

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

Symbol

Address

When reset

TABSR

038016

0016

Count start flag

Bit name

Function

Bit symbol

Timer B2 count start flag

Timer B1 count start flag

Timer B0 count start flag

Timer A4 count start flag

Timer A3 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

TB0S

TA4S

TA3S

TA2S

TA1S

TA0S

Note 1: Use MOV instruction to write to this register.

Note 2: Set the TAiIN and TAiOUT pins correspondent port direction registers to 0 .

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