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UPD16312 Datasheet(PDF) 6 Page - NEC

Part No. UPD16312
Description  1/4- to 1/11-DUTY FIPTM VFD CONTROLLER/DRIVER
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Maker  NEC [NEC]
Homepage  http://www.nec.com/
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 6 page
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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.




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