PT6302_10 Datasheet, PDF (10/27 Pages) Princeton Technology Corp – VFD Driver/Controller IC with Character RAM

PT6302
CGRAM DATA WRITE COMMAND
The Character Generator RAM (CGRAM) Data Write Command is used to specify the CGRAM address (00H to 07H)
and write the character pattern data. It consists of 3 address bits which is used to store the 5 x 7 dot matrix character
patterns. The CGRAM can store up to 8 types of character patterns which may be displayed by specifying the Character
Code (DCRAM Address). The CGRAM Data Write Command Format is given below.
LSB
MSB
1st Byte
(1st)
B0 B1 B2 B3 B4 B5 B6 B7 ^{CGRAM Data Write Mode is selected and the CGRAM}
X0 X1 X2 *
0
1
0
0 ^{Address is specified (i.e. CGRAM Address = 00H).}
2nd Byte
(2nd)
LSB
MSB
B0 B1 B2 B3 B4 B5 B6 B7 ^{1st Column Data is specified and rewritten into the}
CGRAM Address 00H.
C0 C5 C10 C15 C20 C25 C30 *
3rd Byte
(3rd)
LSB
MSB
B0 B1 B2 B3 B4 B5 B6 B7 ^{2nd Column Data is specified and rewritten into the}
C1 C6 C11 C16 C21 C26 C31 * ^{CGRAM Address 00H.}
4th Byte
(4th)
LSB
MSB
B0 B1 B2 B3 B4 B5 B6 B7 ^{3rd Column Data is specified and rewritten into the}
C2 C7 C12 C17 C22 C27 C32 * ^{CGRAM Address 00H.}
5th Byte
(5th)
LSB
MSB
B0 B1 B2 B3 B4 B5 B6 B7 _{4th Column Data is specified and rewritten into the}
C3 C8 C13 C18 C23 C28 C33 * ^{CGRAM Address 00H.}
LSB
MSB
6th Byte
(6th)
B0 B1 B2 B3 B4 B5 B6 B7 _{5th Column Data is specified and rewritten into the}
C4 C9 C14 C19 C24 C29 C34 * ^{CGRAM Address 00H.}
During a continuous data write operation from one CGRAM Address to the next, it is not necessary to specify the
CGRAM address since they are automatically incremented; however, the character pattern data must be specified. The
2nd to the 6th character pattern data byte are considered as one data item, therefore 300ns is sufficient value for
parameter tDOFF between bytes. Please refer to the information below.
LSB
MSB
2nd Byte
(7th)
B0 B1 B2
C0 C5 C10
B3 B4 B5 B6 B7 _{1st Column Data is specified and rewritten into the}
C15 C20 C25 C30 * ^{CGRAM Address 01H.}
:
:
LSB
MSB
6th Byte
(11th)
B0 B1 B2 B3 B4 B5 B6 B7 _{5th Column Data is specified and rewritten into the}
C4 C9 C14 C19 C24 C29 C34 * ^{CGRAM Address 01H.}
where:
1. X0 (LSB) to X2 (MSB): CGRAM Address Bits (8 Characters)
2. C0 (LSB) to C34 (MSB): Character Pattern Data Bits (35 outputs/digit)
V2.1
10
August 2010