Datasheet

PIC17C4X
DS30412C-page 94  1996 Microchip Technology Inc.
TABLE 13-7: REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER TRANSMISSION
FIGURE 13-9: SYNCHRONOUS TRANSMISSION
FIGURE 13-10: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Value on
Power-on
Reset
Value on all
other resets
(Note1)
16h, Bank 1 PIR
RBIF TMR3IF TMR2IF TMR1IF CA2IF CA1IF TXIF RCIF 0000 0010 0000 0010
13h, Bank 0 RCSTA SPEN RX9 SREN CREN
— FERR OERR RX9D 0000 -00x 0000 -00u
16h, Bank 0 TXREG TX7 TX6 TX5 TX4 TX3 TX2 TX1 TX0 xxxx xxxx uuuu uuuu
17h, Bank 1 PIE
RBIE TMR3IE TMR2IE TMR1IE CA2IE CA1IE TXIE RCIE 0000 0000 0000 0000
15h, Bank 0 TXSTA CSRC TX9 TXEN SYNC
— — TRMT TX9D 0000 --1x 0000 --1u
17h, Bank 0 SPBRG Baud rate generator register xxxx xxxx uuuu uuuu
Legend: x = unknown, u = unchanged, - = unimplemented read as a '0', shaded cells are not used for synchronous
master transmission.
Note 1: Other (non power-up) resets include: external reset through MCLR and Watchdog Timer Reset.
Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4 Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q3 Q4
DT
CK
Write to
TXREG
TXIF
Interrupt flag
TRMT
TXEN
'1'
Note: Sync master mode; BRG = 0. Continuous transmission of two 8-bit words.
Write word 1
Write word 2
bit0
bit1 bit2
bit7
bit0
Word 1 Word 2
(RA4/RX/DT pin)
(RA5/TX/CK pin)
DT
CK
Write to
TXREG
TXIF bit
TRMT bit
bit0
bit1
bit2
bit6 bit7
(RA4/RX/DT pin)
(RA5/TX/CK pin)