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Operation, 1 internal clock/reload mode, Operation 5.1 internal clock/reload mode – FUJITSU MB91460 SERIES FR60 User Manual

Page 798

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Chapter 38 Reload Timer

5.Operation

(For information on attributes, see “

Meaning of Bit Attribute Symbols (Page No.10)

”.)

The reload value for the down counter is stored in reload register TMRLR.

Please write using half-word access.

5. Operation

5.1 Internal Clock/Reload Mode

In reload mode, a pulse with a 50% duty ratio is output.

(1)

Set reload value to reload register

(2)

Enable reload timer count operation

(3)

TOT pin output

(4)

Generate reload trigger (activation): soft trigger or external event trigger

(5)

Load reload value

(6)

TOT toggle output start

(7)

Counter count down (internal clock synchronous)

(8)

Generate counter underflow

(9)

TOT pin output level reversal (toggle output)

(10)

Reload reload value

(11)

Repeat steps (7) to (10)

(See “

8. Caution (Page No.794)

”.)

X

X

X

X

X

X

X

X

Initial Value

RX/W

RX/W

RX/W

RX/W

RX/W

RX/W

RX/W

RX/W

Attribute

Count clock

Activation trigger
(Soft or external event)

Underflow

FFFF

Load

data

Reload

data

Reload

data

0000

-1

-1

0000

-1

Data load

T = CLKP

0 (Min)

When RELD=1

Toggle output

OUTL=0

OUTL=1

[Reload register setting value + 1]

Down counter

TOT output waveform

CNTE bit

Count

Count start

Reload data

TMRLR

(1)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(5)

(2)

(10)

(10)

Repeat