PIC16LF870-I/SO View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC16LF870-I/SO

28/40-Pin, 8-Bit CMOS FLASH Microcontrollers

Microchip Technology 

PIC16F870/871

TABLE 9-8: REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER TRANSMISSION

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 — CCP1IF TMR2IF TMR1IF 0000 -000 0000 -000

18h

RCSTA SPEN RX9 SREN CREN — FERR OERR RX9D 0000 -00x 0000 -00x

19h

TXREG USART Transmit Register

0000 0000 0000 0000

8Ch

PIE1

PSPIE(1) ADIE RCIE TXIE — CCP1IE TMR2IE TMR1IE 0000 -000 0000 -000

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, read as '0'. Shaded cells are not used for synchronous master transmission.

Note 1: Bits PSPIE and PSPIF are reserved on the PIC16F870; always maintain these bits clear.

FIGURE 9-9: SYNCHRONOUS TRANSMISSION

Q1Q2 Q3Q4 Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2 Q3Q4

RC7/RX/DT pin

RC6/TX/CK pin

Write to

TXREG reg

TXIF bit

(Interrupt flag)

TRMT bTitRMT

Write word1

bit 0

bit 1

bit 2

WORD 1

Write word2

Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4

bit 7

bit 0

bit 1

bit 7

WORD 2

TXEN bit ’1’

’1’

Note: Sync master mode; SPBRG = '0'. Continuous transmission of two 8-bit words

FIGURE 9-10: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)

RC7/RX/DT pin

bit0

bit1

bit2

bit6

bit7

RC6/TX/CK pin

Write to

TXREG reg

TXIF bit

TRMT bit

TXEN bit

DS30569A-page 74

Preliminary

© 1999 Microchip Technology Inc.

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