PIC16LF877A-I Datasheet, PDF (124/234 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers

PIC16F87XA
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
TMR0IE INTE RBIE TMR0IF 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 28-pin devices; always maintain these bits clear.
FIGURE 10-9:
SYNCHRONOUS TRANSMISSION
Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1Q2Q3 Q4Q1Q2Q3 Q4Q1 Q2 Q3 Q4
RC7/RX/DT
pin
RC6/TX/CK
pin
Write to
TXREG reg
TXIF bit
(Interrupt Flag)
bit 0
bit 1
bit 2
Word 1
Write Word 1
Write Word 2
TRMT bit
Q3 Q4 Q1Q2 Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3 Q4Q1 Q2 Q3Q4 Q1Q2 Q3 Q4 Q1 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 10-10: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
RC7/RX/DT pin
bit 0
bit 1
bit 2
bit 6
bit 7
RC6/TX/CK pin
Write to
TXREG Reg
TXIF bit
TRMT bit
TXEN bit
DS39582B-page 122
 2003 Microchip Technology Inc.