M38B53M4-059FP datasheet(181/355 Pages) MITSUBISHI

181 / 355 page

2-93

38B5 Group User’s Manual

APPLICATION

2.4 FLD controller

P30, P31

P10–P17

P00, P01

P20–P27

P04–P07

Segment

Digit

SP EP

REC

LEVEL

SUN MON TUE WED THU FRI SAT

38B5 Group

Key-matrix

Panel with fluorescent display (FLD)

Segment

2.4.3 FLD controller application examples

(1)

Key-scan using FLD automatic display and segments

Outline: Key read-in with segment pins is performed by software using the FLD automatic display

mode.

Fig. 2.4.15 Connection diagram

Specifications: •Use of total 20 FLD ports (10 digits; 10 segments (8 key-scan included))

•Use of FLD automatic display mode

•Display in gradation display mode and 16 timing mode

•Toff1 = 40

µs, Toff2 = 64 µs, Tdisp = 204 µs, Tscan = 3 ! Tdisp = 720 µs,

f(XIN) = 4 MHz

•Use of FLD blanking interrupt

Figure 2.4.16 shows the timing chart of key-scan, and Figure 2.4.17 shows the enlarged view of

Tscan. After switching the segment pin to an output port, generate the waveform shown Figure 2.4.17

by software and perform key-scan.

Fig. 2.4.16 Timing chart of key-scan using FLD automatic display mode and segments

Tdisp

Tscan

FLD blanking interrupt request occur

FLD16 (P10)

FLD17 (P11)

FLD18 (P12)

FLD25 (P31)

FLD0–FLD9

(P20–P27,

P00, P01)

Key-scan

Toff1

Toff2

• • •

Fig. 2.4.17 Enlarged view of FLD0 (P20) to FLD7 (P27) Tscan

FLD0 (P20)

FLD1 (P21)

FLD2 (P22)

FLD7 (P27)

M38B53M4-059FP Datasheet(PDF) 181 Page - Mitsubishi Electric Semiconductor

M38B53M4-059FP Datasheet(HTML) 181 Page - Mitsubishi Electric Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL