PIC16C63A Microchip Technology, PIC16C63A Datasheet - Page 67

• Manufacturer Part Number: PIC16C63A
• Description: 28/40-Pin 8-Bit CMOS Microcontrollers
• Manufacturer: Microchip Technology

FIGURE 9-4:
FIGURE 9-5:
TABLE 9-6:
Address Name
0Ch
18h
19h
8Ch
98h
99h
Legend: x = unknown, - = unimplemented locations read as '0'. Shaded cells are not used for Asynchronous Transmission.
Note 1: PORTD and PORTE not implemented on the PIC16C63A/73B, maintain as ’0’.
1998 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)
2: A/D not implemented on the PIC16C63A/65B, maintain as ’0’.
BRG output
(shift clock)
BRG output
(shift clock)
PIR1
RCSTA
TXREG USART Transmit Register
PIE1
TXSTA
SPBRG Baud Rate Generator Register
ASYNCHRONOUS TRANSMISSION
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
PSPIF
SPEN
PSPIE
CSRC
Note: This timing diagram shows two consecutive transmissions.
Bit 7
(1)
(1)
Transmit Shift Reg.
WORD 1
Transmit Shift Reg
WORD 1
Word 1
Word 1
ADIF
RX9
ADIE
TX9
Bit 6
(2)
(2)
Start Bit
Start Bit
Word 2
RCIF
SREN
RCIE
TXEN
Bit 5
TXIF
CREN —
TXIE
SYNC —
Bit 0
Bit 4
Bit 0
PIC16C63A/65B/73B/74B
SSPIF CCP1IF TMR2IF
SSPIE CCP1IE TMR2IE TMR1IE
Bit 3
Bit 1
WORD 1
Bit 1
FERR
BRGH
WORD 1
Bit 2
OERR
TRMT
Bit 1
Bit 7/8
TMR1IF
RX9D
TX9D
WORD 2
Transmit Shift Reg.
Bit 7/8
Bit 0
Stop Bit
0000 0000
0000 -00x
0000 0000
0000 0000
0000 -010
0000 0000
Stop Bit
Value on
POR,
BOR
Start Bit
DS30605A-page 67
WORD 2
0000 0000
0000 -00x
0000 0000
0000 0000
0000 -010
0000 0000
Value on
all other
Resets
Bit 0