
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
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
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 Q4
Q3 Q4
DT
CK
Write to
TXREG
TXIF
Interrupt ag
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)