PIC16F87/88
TABLE 11-10: REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER TRANSMISSION
Value on
all other
RESETS
Value on:
POR, BOR
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0Bh, 8Bh, INTCON
10Bh,18Bh
GIE
PEIE TMR0IE INTE
RBIE TMR0IF
INTF
R0IF
0000 000x 0000 000u
0Ch
PIR1
—
ADIF
RX9
RCIF
TXIF SSPIF CCP1IF TMR2IF TMR1IF -000 0000 -000 0000
18h
RCSTA
SPEN
SREN CREN
—
FERR
OERR
RX9D
0000 -00x 0000 -00x
0000 0000 0000 0000
19h
TXREG USART Transmit Register
8Ch
PIE1
—
ADIE
TX9
RCIE
TXIE SSPIE CCP1IE TMR2IE TMR1IE -000 0000 -000 0000
98h
TXSTA
CSRC
TXEN SYNC
—
BRGH
TRMT
TX9D
0000 -010 0000 -010
0000 0000 0000 0000
99h
SPBRG Baud Rate Generator Register
Legend:
x= unknown, - = unimplemented, read as ‘0’. Shaded cells are not used for synchronous master transmission.
FIGURE 11-9:
SYNCHRONOUS TRANSMISSION
Q1Q2 Q3 Q4 Q1Q2 Q3 Q4Q1Q2Q3 Q4Q1Q2Q3 Q4Q1 Q2 Q3 Q4
Q3Q4 Q1Q2 Q3Q4 Q1Q2Q3Q4 Q1Q2Q3 Q4Q1 Q2Q3Q4 Q1Q2Q3 Q4Q1Q2Q3 Q4
RB2/SDO/
RX/DT pin
bit 0
bit 1
bit 2
bit 7
bit 0
bit 1
Word 2
bit 7
Word 1
RB5/SS/TX/
CK pin
Write to
TXREG Reg
Write Word 1
Write Word 2
TXIF bit
(Interrupt Flag)
TRMT bit
‘1’
‘1’
TXEN bit
Note: Sync Master mode; SPBRG = 0. Continuous transmission of two 8-bit words.
FIGURE 11-10:
SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
RB2/SDO/RX/DT pin
bit 0
bit 2
bit 1
bit 6
bit 7
RB5/SS/TX/CK pin
Write to
TXREG Reg
TXIF bit
TRMT bit
TXEN bit
2003 Microchip Technology Inc.
Preliminary
DS30487B-page 109
MICROCHIP [ MICROCHIP ]
