ML9092-01TB datasheet(39/66 Pages) OKI

39 / 66 page

FEDL9092-01

OKI Semiconductor

ML9092-01/02/03/04

39/66

Description of the Data Section in Instructions

• Key scan register (KR)—Read (for ML9092-01/04)

ST2

ST1

ST0

(1) D7 to D5 (ST2 to ST0) (Key scan read count display bits)

25-bit key scan data is divided into 5 groups and read. The read count is indicated by bits ST2 to ST0.

Every time key scan data is read, these bits are automatically incremented over the range of “000” to “100”. After

counting to “100”, this counter is reset to “000” and then again incremented from “000”, thereafter repeating this

cycle. If the

CS signal is risen up during the cycle of counting, the scan read counter bits are returned to “000”.

If the

RESET pin is pulled to a “L” level, these bits are reset to “0”.

(2) D4 to D0 (S4 to S0) (Key scan read data bits)

These bits are read as 25-bit serial data that expresses the key switch status (1 = ON, 0 = OFF). Data is divided into

5 groups and read. (For the read order, refer to the description below.) The read count is indicated by bits ST2 to

ST0.

The correspondence between the scan read count data, key scan data and key matrix switches is shown below.

If the

RESET pin is pulled to a “L” level, these bits are reset to “0”.

ST2

ST1

ST0

SW04

SW03

SW02

SW01

SW00

SW14

SW13

SW12

SW11

SW10

SW24

SW23

SW22

SW21

SW20

SW34

SW33

SW32

SW31

SW30

SW44

SW43

SW42

SW41

SW40

Note: SW00 to SW44 indicate the corresponding switches in Figure 1.

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