3819 datasheet(129/218 Pages) RENESAS

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2. APPLICATION

MITSUBISHI MICROCOMPUTER

3819 Group

2.5 FLD controller

3819 Group USER’S MANUAL

2.5.2 FLD controller application examples

(1) FLD automatic display and Key-scan using segment pin

Outline : The pannel with fluorescent display (FLD) is displayed by using FLD automatic display function.

Then the key is read in with using segment pin by software.

Fig. 2.5.11 Connection diagram [FLD automatic display and Key-scan using segment pin]

Specifications :

• The automatic display function is used.

• 10 digits and 10 segments are used.

• Toff = 15.27

µs, Tdisp = 244.39 µs, Tscan = 733.17 µs (at f(XIN) = 4.19 MHz)

• The FLD blanking interrupt is used.

• The segment pin is used for the Key-scan.

Figure 2.5.12 shows a timing chart of the Key-scan using an FLD automatic display and segments, and Figure

2.5.13 shows an enlarged view of SEG24 to SEG31 during Tscan.

Fig. 2.5.12 Timing chart [FLD automatic display and Key-scan using segment pin]

Tscan

Tdisp

Key-scan

FLD blanking interrupt request occurs

DIG2(P02)

DIG3(P03)

DIG4(P04)

DIG11(P13)

SEG24–SEG33

(P30–P37,P00,P01)

q q q q

P10–P13

P00,P01

P30–P37

digit

segment

SUN MON TUE WED THU FRI SAT

P02–P07

P24–P27

3819 group

SP LP

REC

LEVEL

Key

matrix

Pannel with fluorescent display (FLD)

3819 Datasheet(PDF) 129 Page - Renesas Technology Corp

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