PIC16F628-20P Datasheet, PDF (84/170 Pages) Microchip Technology – FLASH-Based 8-Bit CMOS Microcontroller

PIC16F62X
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 -00x 0000 -00x
19h
TXREG USART Transmit 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
Q1Q2 Q3Q4 Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2 Q3Q4
RB1/RX/DT Pin
RB2/TX/CK Pin
WRITE to
TXREG REG
TXIF Bit
(Interrupt Flag)
TRMT^TRB^Mit^T
Bit 0
Bit 1
Bit 2
WORD 1
Write WORD1
Write WORD2
Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3Q4 Q1Q2 Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4Q1 Q2Q3 Q4
Bit 7
Bit 0
Bit 1
WORD 2
Bit 7
TXEN Bit ^'1'
'1'
Note 1: 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
DS40300C-page 82
Preliminary
 2003 Microchip Technology Inc.