PIC16C63A/65B/73B/74B
TABLE 11-5: REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER TRANSMISSION
Value on:
POR,
BOR
Value on
all other
RESETS
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0Bh,8Bh
0Ch
INTCON
PIR1
GIE
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x
0000 000u
0000 0000
0000 -00x
0000 0000
0000 0000
0000 -010
0000 0000
(1)
(2)
PSPIF
SPEN
ADIF
RX9
RCIF
TXIF SSPIF CCP1IF TMR2IF TMR1IF 0000 0000
18h
RCSTA
SREN CREN
—
FERR
OERR
RX9D
0000 -00x
0000 0000
19h
TXREG USART Transmit Register
(1)
(2)
8Ch
PIE1
PSPIE
CSRC
ADIE
TX9
RCIE
TXIE SSPIE CCP1IE TMR2IE TMR1IE 0000 0000
98h
TXSTA
TXEN SYNC
—
BRGH
TRMT
TX9D
0000 -010
0000 0000
99h
SPBRG Baud Rate Generator Register
Legend: u= unchanged, x= unknown, - = unimplemented, read as '0'.
Shaded cells are not used for synchronous master transmission.
Note 1: Bits PSPIE and PSPIF are reserved on the PIC16C63A/73B; always maintain these bits clear.
2: Bits ADIE and ADIF are reserved on the PIC16C63A/65B; always maintain these bits clear.
FIGURE 11-6:
SYNCHRONOUS TRANSMISSION
Q1Q2 Q3Q4 Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2 Q3Q4
Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4
RC7/RX/DT
pin
bit 0
bit 1
bit 2
bit 7
bit 0
bit 1
bit 7
Word 2
Word 1
RC6/TX/CK
pin
Write to
TXREG reg
Write word1
Write word2
TXIF bit
(Interrupt Flag)
TRMT
TRMT bit
’1’
’1’
TXEN bit
Note: Sync Master mode; SPBRG = ’0’. Continuous transmission of two 8-bit words.
FIGURE 11-7:
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
2000 Microchip Technology Inc.
DS30605C-page 73
MICROCHIP [ MICROCHIP ]
