3819 datasheet(129/218 Pages) RENESAS

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115

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)

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