PIC16F877-20L Datasheet, PDF (106/218 Pages) Microchip Technology – 28/40-Pin 8-Bit CMOS FLASH Microcontrollers

PIC16F87X
TABLE 10-8: 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
0Bh, 8Bh, INTCON GIE
10Bh,18Bh
0Ch
PIR1
PSPIF⁽¹⁾
PEIE
ADIF
T0IE INTE RBIE T0IF INTF R0IF 0000 000x 0000 000u
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.
FIGURE 10-9:
SYNCHRONOUS TRANSMISSION
Q1Q2 Q3Q4 Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2 Q3Q4
RC7/RX/DT pin
RC6/TX/CK pin
bit 0
bit 1
bit 2
Word 1
Write to
TXREG reg
TXIF bit
(Interrupt Flag)
Write Word1
Write Word2
TRMT bit
Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4
bit 7
bit 0
bit 1
bit 7
Word 2
'1'
'1'
TXEN bit
Note: Sync Master mode; SPBRG = '0'. Continuous transmission of two 8-bit words.
FIGURE 10-10: 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
DS30292D-page 106
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