|
PT6314 Datasheet, PDF (25/49 Pages) Texas Instruments – 3 Amp Adjustable Positive Step-down Integrated Switching Regulators | |||
|
◁ |
Tel: 886-2-66296288
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
Dot Character VFD Controller/Driver IC
âENTRY MODEâ INSTRUCTION
PT6314
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
CODE 0 0 0 0 0 0 0 1 I/D S
The âI/Dâ Bit provides a way to modify the contents of the address counter after every access to the
DDRAM or CGRAM. When I/D is set to â1â the Address Counter is incremented after the DDRAM or
CGRAM has been accessed. When the I/D is set to â0â the Address Counter is decremented after the
DDRAM or CGRAM has been accessed.
The âSâ Bit controls the display or cursor shift after each read or write operation to the DDRAM. If S is
set to â1â the âDisplay Shiftâ Instruction is enabled. If the S is set to â0â the âCursor Shiftâ Instruction is
enabled.
The direction in which the display is shifted is opposite to that of the cursor. For example, if S=â0â and
I/D=â1â the cursor will shift one character to the right after the MCU writes to the DDRAM. But, if the
S=â1â and I/D=â1â the display will shift one character to the left and the cursor will remain in the same
position in the panel display. The cursor has already been shifted in the direction selected by the I/D
during the reading of the DDRAM irrespective of the value of âSâ. Reading and writing the CGRAM
always shifts the cursor. Both lines are shifted at the same time.
The table below shows the various cursor and display shift movements by the âEntry Mode Setâ.
I/D
S
After Writing DDRAM Data
After Reading DDRAM Data
0
0 Cursor moves one character to the left. Cursor moves one character to the left.
1
0 Cursor moves one character to the right. Cursor moves one character to the right.
0
1
Display shifts one character to the right
without any cursor movement.
Cursor moves one character to the left.
1
1
Display shifts one character to the left Cursor moves one character to the right.
without any cursor movement.
During Reset,
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
1
1
0
PT6314 V1.3
- 25 -
March, 2006
|
▷ |