[6]?
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Communication?Information?
This?display?uses?a?built‐in?PIC16F690?for?serial?communication.?
100mS?delay?is?required?upon?power‐up?for?the?built‐in?PIC?to?initialize?the?display?controller.?????
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I2C?protocol:?
To?enter?the?I2C?mode,?place?a?jumper?on?R1.??
SDA?and?SDK?have?pull‐up?resistors?(10K?Ohm)?on?R7?and?R8.?
The?default?I2C?address?is?80?(50?hex).??The?I2C?address?can?be?changed?to?any?8‐bit?value?by?command?
function,?with?the?exception?that?the?LSB?(least?significant?bit)?must?always?be?‘0’.??Once?the?I2C?address?has?
been?changed,?it?will?be?saved?in?the?system?memory,?and?it?will?revert?back?to?the?default?address?if?either?RS‐
232?or?SPI?protocol?is?selected.?
The?I2C?interface?is?capable?of?receiving?data?at?up?to?100KHz?clock?rate.?
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SPI?protocol:?
To?enter?the?SPI?mode,?place?a?jumper?on?R2.??
SPI?mode?has?a?normally?high?level?idle?clock.?When?Slave?Select?is?LOW,?data?is?sampled?on?the?rising?edge?of?
the?Clock.?
The?SPI?interface?is?capable?of?receiving?data?at?up?to?100KHz?clock?rate.?
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RS‐232?(TTL)?protocol:?
To?enter?the?RS‐232?mode,?both?R1?and?R2?should?be?open.??
The?RS‐232?signal?must?be?5V?TTL?compatible.?Communication?format?is?8‐bit?data,?1?Stop?bit,?no?parity,?no?
hand‐shaking.?Default?BAUD?rate?is?9600,?and?is?changeable?with?a?command?function.?Once?the?BAUD?rate?
has?been?changed,?it?will?be?saved?in?the?system?memory,?and?it?will?revert?back?to?the?default?address?if?either?
I2C?or?SPI?protocol?is?selected.?
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ASCII?Text?
To?display?normal?text,?just?enter?its?ASCII?number.?A?number?from?0x00?to?0x07?displays?the?user?defined?
custom?character,?0x20?to?0x7F?displays?the?standard?set?of?characters,?0xA0?to?0xFD?display?characters?and?
symbols?that?are?factory‐masked?on?the?ST7066U?controller.?0xFE?is?reserved.?
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