PIC16C774T-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16C774T-I/SO

28/40-Pin, 8-Bit CMOS Microcontrollers w/ 12-Bit A/D

Microchip Technology 

PIC16C77X

FIGURE 9-8: ASYNCHRONOUS RECEPTION WITH ADDRESS BYTE FIRST

RC7/RX/DT (pin)

Start

bit bit0 bit1

Start

bit8 Stop bit bit0

bit

bit8 Stop

bit

Load RSR

Read

Bit8 = 1, Address Byte

Bit8 = 0, Data Byte

WORD 1

RCREG

RCIF

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

because ADEN was not updated and still = 0.

TABLE 9-7 REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION

Address Name

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2

Bit 1

Bit 0

Value on:

POR,

BOR

Value on

all other

Resets

0Ch

PIR1

PSPIF(1) ADIF RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF 0000 0000 0000 0000

18h

RCSTA SPEN RX9 SREN CREN ADDEN FERR OERR RX9D 0000 000x 0000 000x

1Ah

RCREG USART Receive Register

0000 0000 0000 0000

8Ch

PIE1

PSPIE(1) ADIE RCIE TXIE SSPIE CCP1IE TMR2IE TMR1IE 0000 0000 0000 0000

98h

TXSTA CSRC TX9 TXEN SYNC —

BRGH TRMT TX9D 0000 -010 0000 -010

99h

SPBRG Baud Rate Generator Register

0000 0000 0000 0000

Legend: x = unknown, - = unimplemented locations read as '0'. Shaded cells are not used for Asynchronous Reception.

Note 1: Bits PSPIE and PSPIF are reserved on the 28-pin devices, always maintain these bits clear.

DS30275B-page 106

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