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UPD16312 Datasheet(PDF) 6 Page - NEC |
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UPD16312 Datasheet(HTML) 6 Page - NEC |
6 / 20 page 6 PD16312 Key Matrix and Key-Input Data Storage RAM The key matrix is made up of a 6 4 matrix, as shown below. KEY1 KEY2 KEY3 KEY4 The data of each key is stored as illustrated below, and is read with the read command, starting from the least significant bit. KEY1…KEY4 KEY1…KEY4 Seg1/KS1 Seg2/KS2 Seg3/KS3 Seg4/KS4 Seg5/KS5 Seg6/KS6 Reading sequence b0------------ b3 b4 ------------b7 LED Port Data is written to the LED port with the write command, starting from the least port’s least significant bit. When a bit of this port is 0, the corresponding LED lights; when the bit is 1, the LED truns off. The data of bits 5 through 8 are ignored. MSB −− − − b3 b2 b1 b0 Don't care LSB LED1 LED2 LED3 LED4 On power application, all LEDs are unlit. |
Similar Part No. - UPD16312 |
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Similar Description - UPD16312 |
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