PIC16F87XA
TABLE 10-8: REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER TRANSMISSION
Value on:
POR,
Value on all
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
other
BOR
RESETS
0Bh, 8Bh,
INTCON
GIE
PEIE TMR0IE INTE
RBIE TMR0IF
INTF
R0IF
0000 000x 0000 000u
10Bh,18Bh
(1)
0Ch
18h
19h
8Ch
98h
99h
PIR1
PSPIF
SPEN
ADIF
RX9
RCIF
TXIF SSPIF CCP1IF TMR2IF TMR1IF
FERR OERR RX9D
0000 0000 0000 0000
0000 -00x 0000 -00x
0000 0000 0000 0000
0000 0000 0000 0000
0000 -010 0000 -010
0000 0000 0000 0000
RCSTA
SREN CREN
—
TXREG USART Transmit Register
(1)
PIE1
PSPIE
CSRC
ADIE
TX9
RCIE
TXIE SSPIE CCP1IE TMR2IE TMR1IE
BRGH TRMT TX9D
TXSTA
TXEN SYNC
—
SPBRG Baud Rate Generator Register
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
Q1Q2 Q3 Q4 Q1Q2 Q3 Q4Q1Q2Q3 Q4Q1Q2Q3 Q4Q1 Q2 Q3 Q4
Q3Q4 Q1Q2 Q3Q4 Q1Q2Q3Q4 Q1Q2Q3 Q4Q1 Q2Q3Q4 Q1Q2Q3 Q4Q1Q2Q3 Q4
RC7/RX/DT pin
RC6/TX/CK pin
bit 0
bit 1
bit 2
bit 7
bit 0
bit 1
Word 2
bit 7
Word 1
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 10-10:
SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
RC7/RX/DT pin
bit0
bit2
bit1
bit6
bit7
RC6/TX/CK pin
Write to
TXREG Reg
TXIF bit
TRMT bit
TXEN bit
DS39582A-page 120
AdvanceInformation
2001 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
