3819 datasheet(141/218 Pages) RENESAS

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2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.5 FLD controller

3819 Group USER’S MANUAL

Control procedure :

Figure 2.5.24 shows a control procedure.

Fig. 2.5.24 Control procedure [FLD automatic display and Key-scan using digit pin]

Set the related functions for the FLD automatic

display.

Set segment/digit/port.

Set the bits 7 to 4 of the Port P2 direction register

used for the Key- scan to the input mode.

To turn on the display of the corresponding segment : set to “1”

To turn off the display of the corresponding segment : set to “0”

( Note)

Set the FLD digit interrupt request bit to “0”.

Wait until completing to write data to the FLD

digit interrupt request bit.

FLD digit interrupt : Enabled

Start the FLD automatic display.

Note : The display data is rewritten at any time.

RESET

Initialization

FLDM1

FLDM2

FLDDP

P0SDR

P2DPR

P8SPR

PASPR

P2D

(Address:3616)

(Address:3716)

(Address:3816)

(Address:3216)

(Address:3316)

(Address:3416)

(Address:3516)

(Address:0516)

100000002

000000012

000010012

000000112

000000002

IREQ2 (Address:3D 16), bit6

Wait for 1 or more cycles

ICON2 (Address:3F 16)

FLDM2 (Address:37 16)

, bit6

, bit1

FLD automatic

display RAM

(Address:0FB0 16 to 0FC916)

a data to be

displayed

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