UPD16311 NEC, UPD16311 Datasheet - Page 6

• Manufacturer Part Number: UPD16311
• Description: 1/8- to 1/16-DUTY FIPTM VFD CONTROLLER/DRIVER
• Manufacturer: NEC

Key Matrix and Key-Input Data Storage RAM
significant bit.
read.
LED Port
this port is 0, the corresponding LED lights; when the bit is 1, the LED goes off. The data of bits 6 through 8 is
ignored.
6
The key matrix is of 12
The data of each key is stored as illustrated below, and is read by a read command, starting from the least
When the most significant bit of data (Seg
Data is written to the LED port by a write command, starting from the least significant bit of the port. When a bit of
On power application, all the LEDs remain dark.
KEY
KEY
KEY
KEY
1
2
3
4


4 configuration, as shown below.
MSB
b0------------ b3
KEY
Seg
Seg
Seg
Seg
Seg
Seg
Don't care
1
…KEY
11
1
3
5
7
9
/KS
/KS
/KS
/KS
/KS
/KS
1
3
5
7
9
11
12
4
b
7
) has been read, the least significant bit of the next data (Seg
b4 b3 b2 b1 b0
b4 ------------b7
KEY
Seg
Seg
Seg
Seg
Seg
Seg
1
…KEY
10
12
2
4
6
8
/KS
/KS
/KS
/KS
/KS
/KS
2
4
6
8
10
12
4
LSB
Reading sequence
LED1
LED2
LED3
LED4
LED5
PD16311
1
b
0
) is