Datasheet

PIC16F87X
DS30292C-page 106  2001 Microchip Technology Inc.
TABLE 10-8: REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER TRANSMISSION
FIGURE 10-9: SYNCHRONOUS TRANSMISSION
FIGURE 10-10: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
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
0Bh, 8Bh,
10Bh,18Bh
INTCON GIE PEIE
T0IE INTE RBIE T0IF INTF R0IF 0000 000x 0000 000u
0Ch PIR1 PSPIF
(1)
ADIF RCIF TXIF SSPIF CCP1IF TMR2IF TMR1IF
0000 0000 0000 0000
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 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, read as '0'. Shaded cells are not used for synchronous master transmission.
Note 1: Bits PSPIE and PSPIF are reserved on PIC16F873/876 devices; always maintain these bits clear.
bit 0 bit 1 bit 7
Word 1
Q1Q2 Q3Q4Q1 Q2Q3 Q4Q1Q2Q3 Q4Q1Q2Q3 Q4Q1 Q2Q3Q4 Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3Q4 Q1Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3Q4Q1 Q2Q3 Q4
bit 2 bit 0 bit 1 bit 7
RC7/RX/DT pin
RC6/TX/CK pin
Write to
TXREG reg
TXIF bit
(Interrupt Flag)
TXEN bit
’1’ ’1’
Word 2
TRMT bit
Write Word1
Write Word2
Note: Sync Master mode; SPBRG = ’0’. Continuous transmission of two 8-bit words.
RC7/RX/DT pin
RC6/TX/CK pin
Write to
TXREG Reg
TXIF bit
TRMT bit
bit0
bit1
bit2
bit6 bit7
TXEN bit