M38B53M4-059FP datasheet(211/355 Pages) MITSUBISHI

211 / 355 page

2-123

38B5 Group User’s Manual

APPLICATION

2.4 FLD controller

Push registers to stack, etc.

Check timer 4 data ?

Incorrect data (except FE16)

Correct

data (FE16)

Timer 6 interrupt routine

Error processing

FLDM (address 0EF416), bit 1

Transfer present display contents to work RAM

RTI

P5 (address 000A16)

Setting of RESET to M35501FP = “L”,

SEL = “L” signal output

Releasing RESET of M35501FP (Note 2)

Display data is retained as backup.

FLD turned off

T4 (address 002316)

Pop registers

FF16

Setting of timer 4 again

Setting of CLK data to M35501FP

Setting of segment data by display data

of backup

Setting of gradation display control data

Set “1” for dark display

Set “0” for bright display

XXXXXX002

XXXXXX012

T56M (address 002A16), bit 0, 1

FLDM (address 0EF416), bit 1

002

Timer 5, timer 6 count start (Note 4)

FLD turned on, automatic display start (Note 4)

Interrupt occurs each time FLD display cycle = 3.264 ms

Check of OVFOUT output number during FLD display cycle

Only 1 time (=FE16) is correct.

(Note 5)

FLD automatic display RAM

(addresses 0FB016–0FFF16)

Data to be

display

Gradation display control

RAM

(addresses 0F6016–0FAF16)

Gradation

display control

data (Note 1)

Notes 1: When selecting the gradation display, set these registers,

too.

2: After retaining RESET signal output “L” for 2

µs or more,

release reset while CLK signal is “L”.

3: The display data can be rewritten at arbitrary timing.

4: Synchronize count start timing of timer 5 and timer 6 with

FLD automatic display start timing as possible.

5: Set segment data of M35501FP at reset and others

according to necessity.

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