M38B53M4-059FP datasheet(199/355 Pages) MITSUBISHI

199 / 355 page

2-111

38B5 Group User’s Manual

APPLICATION

2.4 FLD controller

Control procedure:

Fig. 2.4.31 Control procedure

RESET

Push registers to stack, etc.

P0 (address 000016), bit 0, bit 1

P1 (address 000216)

P2 (address 000416)

P3 (address 000616), bit 0, bit 1

002

0016

002

RTI

All column display is completed ?

P0 (address 000016), bit 0, bit 1

P2 (address 000416)

Segment

data

P1 (address 000216)

P3 (address 000616), bit 0, bit 1

Digit data

qX: This bit is not used for this application.

Set “0” or “1” to this bit arbitrarily.

Initialization

P0D (address 000116

), bit 4–bit 7

P2D (address 000516)

FLDM (address 0EF416)

IREQ1 (address 003C16), bit 5

00002

111111112

1XXXXX002

Wait until completion of writing to timer 1 interrupt request bit

Timer 1 interrupt request bit cleared

Port direction registers setting

ICON1 (address 003E16), bit 5

T12M (address 002816), bit 0

Timer 1 interrupt: Enabled

Timer 1 count start

Timer 1 interrupt routine

Key-scan is completed ?

Wait until “H” level output of P2

is stabilized.

Set data table for key-scan to P2 (address 000416)

Wait for key-scan

Transfer the contents of P04 to P07

(address 000016) to RAM

Update the data table pointer for key-scan

Keys read-in

(Set the port P0 direction register (P0D) (address

000116) to the input mode on initialization, etc.)

Segment key-scan

FLD display turned off

M38B53M4-059FP Datasheet(PDF) 199 Page - Mitsubishi Electric Semiconductor

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