PT6302_10 Datasheet, PDF (8/27 Pages) Princeton Technology Corp – VFD Driver/Controller IC with Character RAM

PT6302
COMMANDS
The following are the list of commands issued by PT6302. When data is written into the RAM (DCRAM, CGRAM, or
ADRAM) in a continuous manner, the addresses are automatically incremented internally. It is therefore not necessary
to specify the first byte.
NO. COMMAND
1 DCRAM DATA WRITE
LSB
FIRST BYTE
B0 B1 B2 B3 B4 B5
X0 X1 X2 X3 1 0
2 CGRAM DATA WRITE X0 X1 X2 * 0 1
3 ADRAM DATA WRITE X0 X1 X2 X3 1 1
4
GENERAL OUTPUT
PORT SET
P1 P2 *
* 00
5 DISPLAY DUTY SET
D0 D1 D2 * 1 0
6 NO. OF DIGITS SET
K0 K1 K2 * 0 1
7 ALL LIGHTS ON/OFF
LH *
*
11
TEST MODE
00 0
*
00
Notes:
1. The Test Mode is not a user function, but an IC internal function
2. *=Not relevant
3. Xn=RAM address bit, n = 0 to 3
4. Cn=RAM character code bit, n=0 to 34
5. Pn=General output port status bit, n=1 to 2
6. Dn=Display duty bit, n=0 to 2
7. Kn=Number of digits bit, n=0 to 2
8. H=All lights on
9. L=All lights off
MSB LSB
B6 B7 B0 B1
0 0 C0 C1
C0 C5
C1 C6
0 0 C2 C7
C3 C8
C4 C9
0 0 C0 C1
10
10
10
10
01
SECOND BYTE
MSB
B2 B3 B4 B5 B6 B7
C2 C3 C4 C5 C6 C7
C10 C15 C20 C25 C30 *
C11 C16 C21 C26 C31 *
C12 C17 C22 C27 C32 *
C13 C18 C23 C28 C33 *
C14 C19 C24 C29 C34 *
*
*
*
*
*
*
2ND
BYTE
3RD
BYTE
4TH
BYTE
5TH
BYTE
6TH
BYTE
DATA CONTROL RAM (DCRAM) DATA WRITE COMMAND
The DCRAM Data Write Command is used to specify the address of the DCRAM and writes the character code of the
CGROM and CGRAM. The DCRAM consists of 4 address bits which are used to store the CGRAM & CGROM character
codes. The character codes specified by the DCRAM is converted to a 5 x 7 dot matrix character pattern via the CGROM
and CGRAM. The DCRAM can store up to 16 characters. The DCRAM Data Write Command Format is shown below.
1st Byte
(1st)
LSB
B0 B1 B2
X0 X1 X2
MSB
B3 B4 B5 B6 B7 ^{DCRAM Data Write Mode is selected and the}
DCRAM Address is specified. (i.e. DCRAM Address =
X3 1 0 0 0 _0H)
LSB
MSB
2nd Byte
(2nd)
B0 B1 B2
C0 C1 C2
B3 B4 B5 B6 B7 ^{CGROM & CGRAM Character Codes are specified.}
C3 C4 C5 C6 C7 ^{(They are written into the DCRAM Address 0H)}
During a continuous data write operation from one DCRAM Address to the next, it is not necessary to specify the
DCRAM address since they are automatically incremented; however, the character code must be specified. Please refer
to the information below.
LSB
MSB
2nd Byte
(3rd)
B0 B1 B2
C0 C1 C2
B3 B4 B5 B6 B7 ^{Character Code of CGRAM & CGROM are specified and}
C3 C4 C5 C6 C7 ^{written into the DCRAM Address 1H.}
V2.1
8
August 2010