PIC16C77X Datasheet, PDF (105/200 Pages) Microchip Technology – 28/40-Pin, 8-Bit CMOS Microcontrollers w/ 12-Bit A/D

PIC16C77X
FIGURE 9-6: USART RECEIVE BLOCK DIAGRAM
x64 Baud Rate CLK
SPBRG
Baud Rate Generator
CREN
÷ 64
or
÷ 16
RC7/RX/DT
Pin Buffer
and Control
Data
Recovery
OERR
FERR
MSb
RSR register
Stop (8) 7 • • • 1
LSb
0 _Start
RX9
8
SPEN
RX9
ADDEN
RX9
ADDEN
RSR<8>
Enable
Load of
Receive
Buffer
8
RX9D
RCREG register
FIFO
Interrupt
RCIF
RCIE
8
Data Bus
FIGURE 9-7: ASYNCHRONOUS RECEPTION WITH ADDRESS DETECT
RC7/RX/DT (pin)
Start
bit _{bit0 bit1}
Start
bit8 Stop bit bit0
bit
bit8 Stop
bit
Load RSR
Read
Bit8 = 0, Data Byte
Bit8 = 1, Address Byte
WORD 1
RCREG
RCIF
Note: This timing diagram shows a data byte followed by an address byte. The data byte is not read into the RCREG (receive buffer)
because ADDEN = 1.
© 1999 Microchip Technology Inc.
Advance Information
DS30275A-page 105