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ML9090-01- Datasheet(PDF) 19 Page - OKI electronic componets |
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ML9090-01- Datasheet(HTML) 19 Page - OKI electronic componets |
19 / 38 page ¡ Semiconductor ML9090-01,-02 19/38 PEDL9090-02 2. Instructions (Data Registers) • Key scan register (KR) D7 D6 D5 D4 D3 D2 D1 D0 ST2 ST1 ST0 S4 S3 S2 S1 S0 (1) D7 to D5 ST2 to ST0 (Scan read counter) When reading 25-bit key scan data, these bits indicate the number of times scan data has been read. Every time key scan data is read, these bits (ST2 to ST0) are automatically incremented over the range of “000” to “100”. After counting to “100”, this key scan data read counter is reset 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. S4 to S0 key scan data corresponds to each SWN0 of the key matrix shown in figure 1. The relation between the key scan data, key matrix signal and each SWN0 of the key matrix is shown below. If the RESET pin is pulled to a “L” level, these bits are reset to “0”. ST2 0 ST1 0 ST0 0 S4 SW04 S3 SW03 S2 SW02 S1 SW01 S0 SW00 R0 0 0 1 SW14 SW13 SW12 SW11 SW10 R1 0 1 0 SW24 SW23 SW22 SW21 SW20 R2 0 1 1 SW34 SW33 SW32 SW31 SW30 R3 1 0 0 SW44 SW43 SW42 SW41 SW40 R4 |
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