PIC17C42 Microchip Technology, PIC17C42 Datasheet - Page 90

• Manufacturer Part Number: PIC17C42
• Description: High-Performance 8-Bit CMOS EPROM/ROM Microcontroller
• Manufacturer: Microchip Technology

PIC17C4X
FIGURE 13-5: ASYNCHRONOUS MASTER TRANSMISSION
FIGURE 13-6: ASYNCHRONOUS MASTER TRANSMISSION (BACK TO BACK)
TABLE 13-5:
DS30412C-page 90
Address
16h, Bank 1
13h, Bank 0
16h, Bank 0
17h, Bank 1
15h, Bank 0
17h, Bank 0
Legend: x = unknown, u = unchanged, - = unimplemented read as a '0', shaded cells are not used for asynchronous
Note 1: Other (non power-up) resets include: external reset through MCLR and Watchdog Timer Reset.
(RA5/TX/CK pin)
(RA5/TX/CK pin)
Write to TXREG
Write to TXREG
BRG output
(shift clock)
BRG output
(shift clock)
TRMT bit
TRMT bit
transmission.
TXIF bit
TXIF bit
Name
PIR
RCSTA
TXREG
PIE
TXSTA
SPBRG
TX
TX
REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
Note: This timing diagram shows two consecutive transmissions.
Serial port transmit register
Baud rate generator register
CSRC
SPEN
RBIF
RBIE
Bit 7
Transmit Shift Reg.
Word 1
Transmit Shift Reg
Word 1
Word 1
Word 1
TMR3IF TMR2IF TMR1IF
TMR3IE TMR2IE TMR1IE
Bit 6
RX9
TX9
Start Bit
Start Bit
Word 2
SREN
TXEN
Bit 5
Bit 0
CREN
SYNC
Bit 0
Bit 4
CA2IF
CA2IE
Bit 3
—
—
Bit 1
Word 1
Bit 1
Word 1
CA1IF
FERR
CA1IE
Bit 2
—
OERR
TRMT
Bit 1
TXIF
TXIE
Bit 7/8
Word 2
Transmit Shift Reg.
Bit 7/8
RX9D
TX9D
RCIF
RCIE
Bit 0
Stop Bit
1996 Microchip Technology Inc.
Stop Bit
0000 0010
0000 -00x
xxxx xxxx
0000 0000
0000 --1x
xxxx xxxx
Power-on
Value on
Reset
Start Bit
Word 2
other resets
Value on all
0000 0010
0000 -00u
uuuu uuuu
0000 0000
0000 --1u
uuuu uuuu
(Note1)
Bit 0