3819 datasheet(146/218 Pages) RENESAS

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132

2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.5 FLD controller

3819 Group USER’S MANUAL

Control procedure :

Figure 2.5.31 shows a control procedure.

Fig. 2.5.31 Control procedure [FLD display by software]

Set the bits 7 to 4 of the Port P2 direction

mode.

Segment key-scan

FLD display : OFF

Read keys.

(Set the Port P2 direction register (P2D)

(Address:0516) to the input mode in the

initialization.)

Timer 1 interrupt processing routine

Complete Key-scan?

Push register to stack etc.

(Address:0016)

(Address:0216), bit0–bit3

(Address:0616)

0016

00002

0016

Set data table for Key-scan

to port P3 (Address:06 16)

Wait for Key-scan

Transfer the contents of port P2

(Address:0416) to Work RAM

Renew data table pointer for Key-scan

RTI

RESET

Initialization

FLDM1

FLDM2

P2D

(Address:3616), bit7

(Address:3716), bit1, bit0

(Address:0516)

002

000000002

Complete to display all digits?

P0 (Address:0016),bit2–bit7

digit

P1 (Address:0216),bit0–bit3

data

Wait until

the

“H” level output

of port P3 is

stabilized.

P0 (Address:00 16), bit0, bit1

segment

P3 (Address:06 16)

data

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