Realisitic TRC-476
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Integrated Circuits Internal Diagrams

 

 

Pin Descriptions

TX: Transmot/receive select PD: Charge pump output
HOLD: Hold mode select NC: Non connection
INIT: Reset Line SA to SG: Segment drivers for display
TEST: Test point (input) D1, D2: Digit output for display
Vdd,Vss1,Vss2: Power supply K11 to K14: Key input
PIN: Programmable divider input KD1 to KD3: Key scan outputs
XIN,XOUT: Crystal oscillator input, output (e.g. 10.240MHz BEEP: Beep-tone control output
UL: Unlock detected output

 


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