PIC18LF1320-I/SOSQTP 查看數據表（PDF） - Microchip Technology

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PIC18LF1320-I/SOSQTP

18/20/28-Pin High-Performance, Enhanced Flash Microcontrollers with 10-Bit A/D and nanoWatt Technology

Microchip Technology 

PIC18F1220/1320

To set up an Asynchronous Transmission:

1. Initialize the SPBRG register for the appropriate

baud rate. If a high-speed baud rate is desired,

set bit BRGH (see Section 16.2 “EUSART

Baud Rate Generator (BRG)”).

2. Enable the asynchronous serial port by clearing

bit SYNC and setting bit SPEN.

3. If interrupts are desired, set enable bit TXIE.

4. If 9-bit transmission is desired, set transmit bit

TX9. Can be used as address/data bit.

5. Enable the transmission by setting bit TXEN,

which will also set bit TXIF.

6. If 9-bit transmission is selected, the ninth bit

should be loaded in bit TX9D.

7. Load data to the TXREG register (starts

transmission).

If using interrupts, ensure that the GIE and PEIE bits in

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

FIGURE 16-6:

RX (pin)

Rcv Shift

Reg

Rcv Buffer Reg

Read Rcv

Buffer Reg

RCREG

RCIF

(Interrupt Flag)

OERR bit

CREN

ASYNCHRONOUS RECEPTION

Start

bit bit 0 bit 1

Start

bit 7/8 Stop bit bit 0

bit

Word 1

RCREG

Start

bit 7/8 Stop bit

bit

Word 2

RCREG

bit 7/8 Stop

bit

Note:

This timing diagram shows three words appearing on the RX input. The RCREG (receive buffer) is read after

the third word, causing the OERR (overrun) bit to be set.

TABLE 16-6: REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION

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

INTCON GIE/GIEH PEIE/GIEL TMR0IE INT0IE RBIE TMR0IF INT0IF RBIF 0000 000x 0000 000u

PIR1

—

ADIF

RCIF TXIF

— CCP1IF TMR2IF TMR1IF -000 -000 -000 -000

PIE1

—

ADIE

RCIE TXIE

— CCP1IE TMR2IE TMR1IE -000 -000 -000 -000

IPR1

—

ADIP

RCIP TXIP

— CCP1IP TMR2IP TMR1IP -111 -111 -111 -111

RCSTA

SPEN

RX9

SREN CREN ADDEN FERR OERR RX9D 0000 000x 0000 000x

RCREG EUSART Receive Register

0000 0000 0000 0000

TXSTA

CSRC

TX9

TXEN SYNC SENDB BRGH TRMT TX9D 0000 0010 0000 0010

BAUDCTL

—

RCIDL

—

SCKP BRG16 —

WUE ABDEN -1-1 0-00 -1-1 0-00

SPBRGH Baud Rate Generator Register High Byte

0000 0000 0000 0000

SPBRG Baud Rate Generator Register Low Byte

0000 0000 0000 0000

Legend: x = unknown, – = unimplemented locations read as ‘0’. Shaded cells are not used for asynchronous reception.

DS39605F-page 144

© 2007 Microchip Technology Inc.

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