EPVP6300 Datasheet, PDF (48/63 Pages) ELAN Microelectronics Corp – VFD Controller

ePVP6300
VFD Controller
b) Key Scanning Data Buffers:
KEY1
KEY2
KEY3
KEY4
Fig. 10 12 x 4 Configuration Key Matrix
The key matrix is of 12 x 4 configuration is as shown in the above figure.
The data of each key is stored as illustrated below, and is read by a read command, starting
from the least significant bit.
KEY1….KEY4
SEG1/KS1
SEG3/KS3
SEG5/KS5
SEG7/KS7
SEG9/KS9
SEG11/KS11
b0 -- -- b3
KEY1….KEY4
SEG2/KS2
SEG4/KS4
SEG6/KS6
SEG8/KS8
SEG10/KS10
SEG12/KS12
b4 -- -- b7
Reading sequence
When the most significant bit of data (SEG12, b7) has been read, the least significant bit of the
next data (SEG1, b0) is read.
8.1 Commands
A command sets the display mode and status of the VFD driver.
The first 1 byte (b0 to b7) inputted to the ePVP6300 through the DIN pin after the STB pin has
fallen, is regarded as a command. Interrupt event will occur when STB pin is falling.
If STB mode is high while a command/data are being transmitted, serial communication is
initialized, and the command/data being transmitted is invalidated (however, the
command/data already transmitted remain valid).
42 of 63 11.04.2004 (V1.92)
This specification is subject to change without further notice.