PIC16F648ATEML View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16F648ATEML

Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology

Microchip Technology 

PIC16F627A/628A/648A

FIGURE 12-3:

Write to TXREG

BRG output

(shift clock)

RB2/TX/CK (pin)

TXIF bit

(interrupt reg. flag)

ASYNCHRONOUS TRANSMISSION (BACK TO BACK)

Word 1

Word 2

Start bit

bit 0

bit 1

Word 1

bit 7/8 Stop bit

Start bit

bit 0

Word 2

TRMT bit

(Transmit shift

reg. empty flag)

Word 1

Transmit Shift Reg.

.

Note: This timing diagram shows two consecutive transmissions.

Word 2

Transmit Shift Reg.

TABLE 12-6: REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION

Address Name

Bit 7

Bit 6 Bit 5 Bit 4 Bit 3 Bit 2

Bit 1

Bit 0

Value on

POR

Value on

all other

Resets

0Ch

18h

19h

8Ch

98h

99h

Legend:

PIR1

EEIF CMIF RCIF TXIF

— CCP1IF TMR2IF TMR1IF

RCSTA SPEN RX9 SREN CREN ADEN FERR OERR RX9D

TXREG USART Transmit Data Register

PIE1

EEIE CMIE RCIE TXIE

— CCP1IE TMR2IE TMR1IE

TXSTA CSRC TX9 TXEN SYNC — BRGH TRMT TX9D

SPBRG Baud Rate Generator Register

x = unknown, - = unimplemented locations read as ‘0’.

Shaded cells are not used for Asynchronous Transmission.

0000 -000

0000 000x

0000 0000

0000 -000

0000 -010

0000 0000

0000 -000

0000 000x

0000 0000

0000 -000

0000 -010

0000 0000

© 2007 Microchip Technology Inc.

DS40044F-page 79

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