PT6312_10 Datasheet, PDF (9/21 Pages) Princeton Technology Corp – VFD Driver/Controller IC

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VFD Driver/Controller IC
PT6312
LED Display
PT6312 provides 4 LED Display Terminals, namely LED1 to LED4. Data is written to the LED Port
starting from the least significant bit (b0) of the port using a WRITE Command. Each bit starting from
the least significant (b0) activates a specific LED Display Terminal -- b0 corresponds LED1 Display, b1
activates LED2 and so forth. Since there are only 4 LED display terminals, bits 5 to 8 (b4 ~ b7) are not
used and therefore ignored. This means that b4 to b7 does NOT in anyway activate any LED Display,
they are totally ignored.
When a bit (b0 ~ b3) in the LED Port is “0”, the corresponding LED is ON. Conversely, when the bit is
“1”, the LED Display is turned OFF. For example, Bit 1 (as designated by b0) has the value of “0”, then
this means that LED1 is ON. It must be noted that when power is turned ON, bit 4 to bit 1 (b3 to b0) are
given the value of “1”. Please refer to the diagrams below.
MSB
LSB
- - - - b3 b2 b1 b0
Not used
LED1
LED2
LED3
LED4
Switch Data
PT6312 provides 4 Switch Inputs, namely SW1 to SW4. SW Data is read starting from the least
significant bit (b0) using a READ Command. Each bit starting from the least significant (b0) correspond
to a specific Switch Input -- b0 corresponds SW1, b1 to SW2 and so forth. Since there are only 4 Switch
Inputs, Bits 5 to 8 (b4 to 7) are given the value of “0”. Please refer to the diagram below.
MSB
LSB
0 0 0 0 b3 b2 b1 b0
SW1
SW2
SW3
SW4
PT6312 V2.6
-9-
December, 2005