UPD16312GB-3B4 查看數據表（PDF） - NEC => Renesas Technology

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UPD16312GB-3B4

1/4- to 1/11-DUTY FIP (VFD) CONTROLLER/DRIVER

NEC => Renesas Technology 

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

PD16312

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

Seg5/KS5

Seg4/KS4

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

LSB

− − − − b3 b2 b1 b0

Don't care

On power application, all LEDs are unlit.

LED1

LED2

LED3

LED4

6

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