M38B53M4-059FP datasheet(208/355 Pages) MITSUBISHI

208 / 355 page

38B5 Group User’s Manual

2-120

APPLICATION

2.4 FLD controller

Figure 2.4.41 shows the setting of relevant registers.

Fig. 2.4.41 Setting of relevant registers

TOFF21 0 16

TDISP3216

TOFF10A16

11 1

0 001 1

P0FPR

P5D

1 0 1 0

0 0 0 1

FLDM

Set P00–P07 to FLD output ports (FLD8–FLD15)

P2FPR

Port P2FLD/port switch register (address 0EFA16)

Set P20–P27 to FLD output ports (FLD0–FLD7)

P8FPR

Set P84–P86 to general-purpose I/O ports

Set P87 to FLD output port (FLD39)

Port P8FLD/port switch register (address 0EFB16)

Set P80–P83 to FLD output ports (FLD32–FLD35)

Set P50 to general-purpose output port (for M35501 RESET signal)

Port P5 direction register (address 000B16)

Set P51 to general-purpose output port (for M35501 SEL signal)

Port P5 (address 000A16)

M35501 RESET signal output (Note 1)

M35501 SEL signal “L” output

Note 1: After retain RESET signal output “L” for 2

µs or more, release reset by

outputting“H” level from RESET signal output at CLK signal = “L” .

FLDC mode register (address 0EF416)

Automatic display mode

Display stopped

Tscan = 0 FLD digit interrupt

16 timing mode

Gradation display mode selected

Tdisp counter count source : f(XIN)/16

High-breakdown voltage port drivability weak

Tdisp time set register (address 0EF516)

50 (3216) set; (50 + 1) ! count source = 204

µs

Count source = f(XIN)/16 = 4

µs, at f(XIN) = 4 MHz

Toff1 time set register (address 0EF616)

10 (A16) set; 10 ! count source = 40

µs

Count source = f(XIN)/16 = 4

µs, at f(XIN) = 4 MHz

Toff 2 t ime set regist er ( address 0EF716) (Note 2)

16 (1016) set; 16 ! count source = 64

µs

Count source = f(XIN)/16 = 4

µs, at f(XIN) = 4 MHz

Note 2: Perform this setting when the gradation display mode is selected.

M38B53M4-059FP Datasheet(PDF) 208 Page - Mitsubishi Electric Semiconductor

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