PIC16C773 Microchip Technology, PIC16C773 Datasheet - Page 103

• Manufacturer Part Number: PIC16C773
• Description: 28/40-Pin/ 8-Bit CMOS Microcontrollers w/ 12-Bit A/D
• Manufacturer: Microchip Technology

FIGURE 9-4:
FIGURE 9-5:
TABLE 9-6
Address
0Ch
18h
19h
8Ch
98h
99h
Legend: x = unknown, - = unimplemented locations read as '0'. Shaded cells are not used for Asynchronous Transmission.
Note 1: Bits PSPIE and PSPIF are reserved on the 28-pin devices, always maintain these bits clear.
1999 Microchip Technology Inc.
TXIF bit
(interrupt reg. flag)
RC6/TX/CK (pin)
RC6/TX/CK (pin)
TRMT bit
(Transmit shift
reg. empty flag)
Write to TXREG
Write to TXREG
TXIF bit
(Transmit buffer
reg. empty flag)
TRMT bit
(Transmit shift
reg. empty flag)
BRG output
(shift clock)
BRG output
(shift clock)
Name
PIR1
RCSTA
TXREG
PIE1
TXSTA
SPBRG
ASYNCHRONOUS TRANSMISSION
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
USART Transmit Register
Baud Rate Generator Register
Note: This timing diagram shows two consecutive transmissions.
PSPIF
PSPIE
SPEN
CSRC
Bit 7
Transmit Shift Reg.
WORD 1
Transmit Shift Reg
WORD 1
(1)
(1)
Word 1
Word 1
ADIE
ADIF
Bit 6
RX9
TX9
Start Bit
Start Bit
Word 2
SREN
TXEN
RCIF
RCIE
Bit 5
Advance Information
CREN
SYNC
Bit 4
TXIF
TXIE
Bit 0
Bit 0
ADDEN
SSPIF
SSPIE
Bit 3
—
Bit 1
WORD 1
Bit 1
CCP1IE
CCP1IF
WORD 1
BRGH
FERR
Bit 2
TMR2IF
TMR2IE
OERR
TRMT
Bit 1
Bit 7/8
WORD 2
Transmit Shift Reg.
TMR1IF
TMR1IE
RX9D
TX9D
Bit 0
Bit 7/8
Stop Bit
PIC16C77X
0000 0000
0000 000x
0000 0000
0000 0000
0000 -010
0000 0000
Stop Bit
Value on:
POR,
BOR
Start Bit
DS30275A-page 103
WORD 2
0000 0000
0000 000x
0000 0000
0000 0000
0000 -010
0000 0000
Value on
all other
Resets
Bit 0