PT6311_10 Datasheet, PDF (11/22 Pages) Princeton Technology Corp – VFD Driver/Controller IC

PT6311
LED DISPLAY
PT6311 provides 5 LED Display Terminals, namely LED1 to LED5. 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 5
LED display terminals, bits 6 to 8 (b5 ~ b7) are not used and therefore ignored. This means that b5 to b7 does NOT in
anyway activate any LED Display, they are totally ignored.
When a bit (b0 ~ b4) 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 5 to bit 1 (b4 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
LED5
SWITCH DATA
PT6311 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) corresponds 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
V3.2
11
November 2009