M38B53M4-059FP datasheet(187/355 Pages) MITSUBISHI

187 / 355 page

2-99

38B5 Group User’s Manual

APPLICATION

2.4 FLD controller

P2 (address 000416)

P2FPR (address 0EFA16)

FLDM (address 0EF416), bit 0

0016

111111112

Push registers to stack, etc.

FLDM (address 0EF416), bit 0

P1 (address 000216)

P3 (address 000616), bit 0, bit 1

P2FPR (address 0EFA16)

P2 (address 000416)

0016

002

000000002

0016

Key-scan is completed ? (Note)

FLD blanking interrupt routine

Switching from automatic display mode to general-purpose mode

Setting of “L” level to port corresponding to digit

Setting of port to be used for key-scan to general-purpose port

Output of “L” level from all ports for key-scan

Wait until “H” level output of P2 is stabilized

Set data table for key-scan to P2 (address

000416)

Wait for key-scan

Transfer the contents of P04 to P07 (address

000016) to RAM

Update the data table pointer for key-scan

Set key-scan completion flag

Initialize data table pointer for key-scan

RTI

Keys read-in

(Set the port P0 direction register (P0D) (address

000116) to the input mode in the initialization, etc.)

Note: If key-scan is not completed within Tscan set

time, perform key-scan separately.

Segment key-scan

Data table reference pointer for the next key-scan updated

Setting of flag which judge whether key-scan is completed or not

Output of “L” level from all key-scan ports

Setting of general-purpose ports to FLD ports

Switching from general-purpose mode to the automatic

display mode

M38B53M4-059FP Datasheet(PDF) 187 Page - Mitsubishi Electric Semiconductor

M38B53M4-059FP Datasheet(HTML) 187 Page - Mitsubishi Electric Semiconductor

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