PIC16F627A Datasheet, PDF (86/168 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontrollers

PIC16F627A/628A/648A
TABLE 12-9: REGISTERS ASSOCIATED WITH SYNCHRONOUS MASTER TRANSMISSION
Address Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR
Value on all
other
RESETS
0Ch PIR1 EEIF CMIF RCIF TXIF — CCP1IF TMR2IF TMR1IF 0000 -000 0000 -000
18h RCSTA SPEN RX9 SREN CREN ADEN FERR OERR RX9D 0000 000x 0000 000x
19h TXREG USART Transmit data register
0000 0000 0000 0000
8Ch PIE1 EEIE CMIE RCIE TXIE — CCP1IE TMR2IE TMR1IE 0000 -000 0000 -000
98h TXSTA CSRC TX9 TXEN SYNC — BRGH TRMT TX9D 0000 -010 0000 -010
99h SPBRG Baud Rate Generator Register
0000 0000 0000 0000
Legend: x = unknown, - = unimplemented, read as '0'. Shaded cells are not used for Synchronous Master Transmission.
FIGURE 12-12: SYNCHRONOUS TRANSMISSION
Q1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4 Q3Q4 Q1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4Q1 Q2Q3Q4Q1Q2Q3Q4
RB1/RX/DT PIN
BIT 0
BIT 1
RB2/TX/CK PIN
WORD 1
WRITE TO
TXREG REG
WRITE WORD1
TXIF BIT
(INTERRUPT FLAG)
WRITE WORD2
BIT 2
TRMT^TRB^MIT^T
BIT 7
BIT 0
BIT 1
WORD 2
BIT 7
'1'
'1'
TXEN BIT
Note: Sync Master Mode; SPBRG = ‘0’. Continuous transmission of two 8-bit words.
FIGURE 12-13: SYNCHRONOUS TRANSMISSION (THROUGH TXEN)
RB1/RX/DT PIN
BIT0
BIT1
BIT2
BIT6
BIT7
RB2/TX/CK PIN
WRITE TO
TXREG REG
TXIF BIT
TRMT BIT
TXEN BIT
DS40044A-page 84
Preliminary
 2002 Microchip Technology Inc.