M16CSLASH26 datasheet(84/239 Pages) RENESAS

84 / 239 page

Renesas Technology Corp.

Timer A

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.

Timer A

Figure 1.12.3 shows the block diagram of timer A. Figures 1.12.4 to 1.12.6 show the timer A-related

registers.

Except in event counter mode, timers A0 through A4 all have the same function. Use the timer Ai mode

Timer A has the four operation modes listed as follows:

• Timer mode: The timer counts an internal count source.

• Event counter mode: The timer counts pulses from an external source or a timer over flow.

• One-shot timer mode: The timer stops counting when the count reaches “000016”.

• Pulse width modulation (PWM) mode: The timer outputs pulses of a given width.

Figure 1.12.4. Timer A-related registers (1)

Timer Ai mode register

Symbol

Address

When reset

TAiMR(i=0 to 4)

039616 to 039A16

0016

Bit name

Function

Bit symbol

0 0 : Timer mode

0 1 : Event counter mode

1 0 : One-shot timer mode

1 1 : Pulse width modulation

(PWM) mode

b1 b0

TCK1

MR3

MR2

MR1

TMOD1

MR0

TMOD0

TCK0

Function varies with each operation mode

Count source select bit

(Function varies with each operation mode)

Operation mode select bit

Figure 1.12.3. Block diagram of timer A

Count start flag

(Address 038016)

Up count/down count

TAi

Addresses

TAj

TAk

Timer A0

038716

038616

Timer A4

Timer A1

038916

038816

Timer A0

Timer A2

038B16

038A16

Timer A1

Timer A3

038D16

038C16

Timer A2

Timer A4

038F16

038E16

Timer A3

Timer A0

Always down count except

in event counter mode

Reload register (16)

Counter (16)

Low-order

8 bits

High-order

8 bits

Clock source

selection

ÄTimer

(gate function)

ÄTimer

ÄOne shot

ÄPWM

f32

TAiIN

(i = 0 to 4)

TB2 overflow

ÄEvent counter

fC32

Clock selection

TAj overflow

(j = i

1. Note, however, that j = 4 when i = 0)

Pulse output

Toggle flip-flop

TAiOUT

(i = 0 to 4)

Data bus low-order bits

Data bus high-order bits

Up/down flag

Down count

(Address 038416)

TAk overflow

(k = i + 1. Note, however, that k = 0 when i = 4)

Polarity

selection

Clock selection

To external

trigger circuit

f1 or f2

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