PT6311

V3.2

November 2009

11

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

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

LED1

LED2

LED3

LED4

LED5

SW1

SW2

SW3

SW4