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SFR explanation for PIC16F628(4)
RCSTA ( Receive Status and Control Register ) 18h
This register controls USART receive function.
The value in the parenthesis is in the condition immediately after the turning on.
TXREG ( Transmit buffer ) 19h
Transmit data is set to this buffer.
RCREG ( Receive buffer ) 1Ah
Received data is stored to this buffer.