PIC18F4550ESOSQTP datasheet(258/430 Pages) MICROCHIP

258 / 430 page

PIC18F2455/2550/4455/4550

DS39632D-page 256

Preliminary

20.3.2

EUSART SYNCHRONOUS

MASTER RECEPTION

Once Synchronous mode is selected, reception is

enabled by setting either the Single Receive Enable bit,

SREN (RCSTA<5>), or the Continuous Receive

Enable bit, CREN (RCSTA<4>). Data is sampled on the

RX pin on the falling edge of the clock.

If enable bit SREN is set, only a single word is received.

If enable bit CREN is set, the reception is continuous

until CREN is cleared. If both bits are set, then CREN

takes precedence.

To set up a Synchronous Master Reception:

Initialize the SPBRGH:SPBRG registers for the

appropriate baud rate. Set or clear the BRG16

bit, as required, to achieve the desired baud rate.

Enable the synchronous master serial port by

setting bits SYNC, SPEN and CSRC.

Ensure bits CREN and SREN are clear.

If the signal from the CK pin is to be inverted, set

the TXCKP bit. If the signal from the DT pin is to

be inverted, set the RXDTP bit.

If interrupts are desired, set enable bit RCIE.

If 9-bit reception is desired, set bit RX9.

If a single reception is required, set bit SREN.

For continuous reception, set bit CREN.

Interrupt flag bit, RCIF, will be set when reception

is complete and an interrupt will be generated if

the enable bit, RCIE, was set.

Read the RCSTA register to get the 9th bit (if

enabled) and determine if any error occurred

during reception.

10. Read the 8-bit received data by reading the

RCREG register.

11. If any error occurred, clear the error by clearing

bit CREN.

12. If using interrupts, ensure that the GIE and PEIE bits

in the INTCON register (INTCON<7:6>) are set.

FIGURE 20-13:

SYNCHRONOUS RECEPTION (MASTER MODE, SREN)

TABLE 20-8:

REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER RECEPTION

Name

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Reset Values

on page

INTCON

GIE/GIEH PEIE/GIEL TMR0IE

INT0IE

RBIE

TMR0IF

INT0IF

RBIF

PIR1

SPPIF(1)

ADIF

RCIF

TXIF

SSPIF

CCP1IF

TMR2IF

TMR1IF

PIE1

SPPIE(1)

ADIE

RCIE

TXIE

SSPIE

CCP1IE

TMR2IE

TMR1IE

IPR1

SPPIP(1)

ADIP

RCIP

TXIP

SSPIP

CCP1IP

TMR2IP

TMR1IP

RCSTA

SPEN

RX9

SREN

CREN

ADDEN

FERR

OERR

RX9D

RCREG

EUSART Receive Register

TXSTA

CSRC

TX9

TXEN

SYNC

SENDB

BRGH

TRMT

TX9D

BAUDCON

ABDOVF

RCIDL

RXDTP

TXCKP

BRG16

—

WUE

ABDEN

SPBRGH

EUSART Baud Rate Generator Register High Byte

SPBRG

EUSART Baud Rate Generator Register Low Byte

Legend: — = unimplemented, read as ‘0’. Shaded cells are not used for synchronous master reception.

Note 1:

Reserved in 28-pin devices; always maintain these bits clear.

CREN bit

RC7/RX/DT/SDO

RC6/TX/CK pin

Write to

bit SREN

SREN bit

RCIF bit

(Interrupt)

Read

RXREG

Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

‘0’

bit 0

bit 1

bit 2

bit 3

bit 4

bit 5

bit 6

bit 7

‘0’

Q1 Q2 Q3 Q4

Note:

Timing diagram demonstrates Sync Master mode with bit SREN = 1 and bit BRGH = 0.

RC6/TX/CK pin

(TXCKP = 0)

(TXCKP = 1)

PIC18F4550ESOSQTP Datasheet(PDF) 258 Page - Microchip Technology

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