M38B53M4-059FP datasheet(206/355 Pages) MITSUBISHI

206 / 355 page

38B5 Group User’s Manual

2-118

APPLICATION

2.4 FLD controller

Fig. 2.4.38 Connection diagram

Specifications: •Use of M35501FP (M35501: 16 digits, 38B5 Group: 36 segments)

_____________

Ports P50 and P51 of 38B5 Group supply signal to the RESET and SEL pins of

M35501FP respectively.

The P87 pin (FLD port vacant pin) supply signals to the CLK pin of M35501FP.

•Use of FLD automatic display mode of 38B5 Group

•Display in gradation display mode and 16 timing mode

•Toff1 = 40

µs, Toff2 = 64 µs, Tdisp = 204 µs, f(XIN) = 4 MHz

Countermeasures against

→ •OVFOUT output of M35501FP input to CNTR1 pin of 38B5 Group

column discrepancycolumn

Input signal to CNTR1 pin is counted as a count source by timer

discrepancy

4 of 38B5 Group

The timer 6 interrupt is generated each time FLD display period

(Tdisp (204

µs) ! 16 column = 3.264 ms), and a value of timer

4 is confirmed. M35501FP is reset at incorrect state.

Figure 2.4.39 shows the timing chart (at correct state) of 38B5 Group and M35501FP, and Figure

2.4.40 shows the timing chart (at incorrect state) of 38B5 Group and M35501FP.

(5)

Display by combination with digit expander (M35501FP*) (example considering column discrepancy

prevention)

* For M35501FP, refer to section “3.12 M35501FP”.

Outline: In the case of (4), which is displayed by using the digit expander (M35501FP), if a noise

enters signals between 38B5 Group and M35501FP, a column discrepancy of display may

occur. Prevent the column discrepancy by using the OVFOUT output of M35501FP.

The OVFOUT pin of M35501FP outputs an overflow signal. The overflow signal is the

signal which outputs “H” synchronizing to the last digit output signal of M35501FP, and

the signal is output at definite intervals in the correct state. Incorrect state is detected by

measuring the output period of this signal, and a column discrepancy is prevented.

Digit (16)

Fluorescent display (FLD)

P30–P37

P10–P17

P00–P07

P20–P27

Segment (36)

38B5 Group

M35501FP

CLK

SEL

RESET

DIG0–DIG15

P80–P83

P87

P50

P51

OVFIN

TRACK

DISC

SLEEP

REC

DATE

CLOCK

REC

1234

567

21222324

29 30 31 32 33 34 35 36

CNTR1

OVFOUT

M38B53M4-059FP Datasheet(PDF) 206 Page - Mitsubishi Electric Semiconductor

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