PIC16F627-04/SS View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F627-04/SS

FLASH-Based 8-Bit CMOS Microcontroller

Microchip Technology 

PIC16F62X

FIGURE 12-9:

ASYNCHRONOUS RECEPTION WITH ADDRESS DETECT

RB1/RX/DT (PIN)

START

BIT BIT0 BIT1

RCV SHIFT REG

START

BIT8 STOP BIT BIT0

BIT

BIT8 STOP

BIT

RCV BUFFER REG

READ RCV

BUFFER REG

RCREG

BIT8 = 0, DATA BYTE

BIT8 = 1, ADDRESS BYTE WORD 1

RCREG

RCIF

(INTERRUPT FLAG)

ADEN = 1

'1'

'1'

(ADDRESS MATCH

ENABLE)

Note 1: This timing diagram shows a data byte followed by an address byte. The data byte is not read into the RCREG

(Receive Buffer) because ADEN = 1 and Bit 8 = 0.

FIGURE 12-10: ASYNCHRONOUS RECEPTION WITH ADDRESS BYTE FIRST

RB1/RX/DT (PIN)

START

BIT BIT0 BIT1

START

BIT8 STOP BIT BIT0

BIT

BIT8 STOP

BIT

RCV SHIFT

REG

RCV BUFFER REG

READ RCV

BIT8 = 1, ADDRESS BYTE WORD 1

RCREG

BIT8 = 0, DATA BYTE

BUFFER REG

RCREG

RCIF

(INTERRUPT FLAG)

'1'

'1'

ADEN = 1

(ADDRESS MATCH

ENABLE)

Note 1: This timing diagram shows an address byte followed by an data byte. The data byte is not read into the RCREG

(receive buffer) because ADEN was not updated (still = 1) and Bit 8 = 0.

FIGURE 12-11:

ASYNCHRONOUS RECEPTION WITH ADDRESS BYTE FIRST FOLLOWED BY

VALID DATA BYTE

RB1/RX/DT (PIN)

START

BIT BIT0 BIT1

START

BIT8 STOP BIT BIT0

BIT

BIT8 STOP

BIT

RCV SHIFT

REG

RCV BUFFER REG

READ RCV

BUFFER REG

BIT8 = 1, ADDRESS BYTE WORD 1 BIT8 = 0, DATA BYTE WORD 2

RCREG

RCREG

RCREG

RCIF

(INTERRUPT FLAG)

ADEN

(ADDRESS MATCH

ENABLE)

Note 1: This timing diagram shows an address byte followed by an data byte. The data byte is read into the RCREG

(Receive Buffer) 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 Bit 8.

DS40300C-page 78

Preliminary

 2003 Microchip Technology Inc.

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