PIC16F627-04 Microchip Technology, PIC16F627-04 Datasheet - Page 81

• Manufacturer Part Number: PIC16F627-04
• Description: FLASH-Based 8-Bit CMOS Microcontrollers
• Manufacturer: Microchip Technology

FIGURE 12-9: ASYNCHRONOUS RECEPTION WITH ADDRESS DETECT
FIGURE 12-10: ASYNCHRONOUS RECEPTION WITH ADDRESS BYTE FIRST
FIGURE 12-11: ASYNCHRONOUS RECEPTION WITH ADDRESS BYTE FIRST FOLLOWED BY VALID
1999 Microchip Technology Inc.
RC7/RX/DT (pin)
RC7/RX/DT (pin)
RC7/RX/DT (pin)
Rcv shift reg
Rcv buffer reg
Read Rcv
buffer reg
RCREG
RCIF
(interrupt flag)
ADEN = 1
(address match
Rcv shift
reg
Rcv buffer reg
Read Rcv
buffer reg
RCREG
RCIF
(interrupt flag)
ADEN = 1
(address match
Rcv shift
reg
Rcv buffer reg
Read Rcv
buffer reg
RCREG
RCIF
(interrupt flag)
ADEN
(address match
enable)
enable)
enable)
Note: This timing diagram shows a data byte followed by an address byte. The data byte is not read into the RCREG (receive buffer)
Note: This timing diagram shows an address byte followed by an data byte. The data byte is not read into the RCREG (receive buffer)
Note: This timing diagram shows an address byte followed by an data byte. The data byte is read into the RCREG (receive buffer)
because ADEN = 1 and bit8 = 0.
because ADEN was not updated (still = 1) and bit8 = 0.
because ADEN was updated after an address match, and was cleared to a ‘0’, so the contents of the receive shift register (RSR)
are read into the receive buffer regardless of the value of bit8.
’1’
’1’
DATA BYTE
Start
Start
Start
bit
bit
bit
bit0
bit0
bit0
Bit8 = 1, Address Byte
Bit8 = 1, Address Byte
Bit8 = 0, Data Byte
bit1
bit1
bit1
bit8
bit8
bit8
Preliminary
Stop
Stop
Stop
bit
bit
bit
WORD 1
RCREG
WORD 1
RCREG
Start
Start
Start
bit
bit
bit
Bit8 = 1, Address Byte
bit0
bit0
bit0
Bit8 = 0, Data Byte
Bit8 = 0, Data Byte
bit8
bit8
bit8
Stop
Stop
Stop
bit
bit
bit
WORD 2
RCREG
WORD 1
RCREG
PIC16F62X
DS40300B-page 81
’1’
’1’