PIC16F877A-I/PT Microchip Technology Inc., PIC16F877A-I/PT Datasheet - Page 104

• Manufacturer Part Number: PIC16F877A-I/PT
• Description: 44 PIN, 7 KB FLASH, 368 RAM, 33 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F877A-I/PT

• A/d Inputs: 8-Channel, 10-Bit
• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 33
• Interface: I2C/SPI/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 44-pin TQFP
• Programmable Memory: 14K Bytes
• Ram Size: 368 Bytes
• Speed: 20 MHz
• Timers: 2-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F87X
FIGURE 10-5:
When setting up an Asynchronous Reception, follow
these steps:
1.
2.
3.
4.
5.
TABLE 10-6:
DS30292C-page 102
0Bh, 8Bh,
10Bh,18Bh
0Ch
18h
1Ah
8Ch
98h
99h
Legend: x = unknown, - = unimplemented locations read as '0'. Shaded cells are not used for asynchronous reception.
Note 1: Bits PSPIE and PSPIF are reserved on PIC16F873/876 devices; always maintain these bits clear.
Address
Initialize the SPBRG register for the appropriate
baud rate. If a high speed baud rate is desired,
set bit BRGH (Section 10.1).
Enable the asynchronous serial port by clearing
bit SYNC and setting bit SPEN.
If interrupts are desired, then set enable bit
RCIE.
If 9-bit reception is desired, then set bit RX9.
Enable the reception by setting bit CREN.
Note:
RX (pin)
Rcv Shift
Reg
Rcv Buffer Reg
Read Rcv
Buffer Reg
RCREG
RCIF
(Interrupt Flag)
OERR bit
CREN
This timing diagram shows three words appearing on the RX input. The RCREG (receive buffer) is read after the third word,
causing the OERR (overrun) bit to be set.
INTCON
PIR1
RCSTA
RCREG USART Receive Register
PIE1
TXSTA
SPBRG Baud Rate Generator Register
Name
REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION
PSPIE
PSPIF
START
SPEN
CSRC
ASYNCHRONOUS RECEPTION
Bit 7
bit
GIE
(1)
(1)
bit0
PEIE
ADIF
ADIE
Bit 6
RX9
TX9
bit1
SREN
TXEN
RCIF
RCIE
Bit 5
T0IE
bit7/8
CREN
SYNC
INTE
Bit 4
TXIF
TXIE
STOP
bit
Word 1
RCREG
START
SSPIF CCP1IF TMR2IF TMR1IF
SSPIE CCP1IE TMR2IE TMR1IE
bit
RBIE
Bit 3
—
—
bit0
6.
7.
8.
9.
10. If using interrupts, ensure that GIE and PEIE
BRGH
FERR
Bit 2
T0IF
Flag bit RCIF will be set when reception is com-
plete and an interrupt will be generated if enable
bit RCIE is set.
Read the RCSTA register to get the ninth bit (if
enabled) and determine if any error occurred
during reception.
Read the 8-bit received data by reading the
RCREG register.
If any error occurred, clear the error by clearing
enable bit CREN.
(bits 7 and 6) of the INTCON register are set.
bit7/8 STOP
Word 2
RCREG
OERR
TRMT
Bit 1
INTF
bit
RX9D
TX9D
Bit 0
R0IF
START
bit
2001 Microchip Technology Inc.
0000 000x
0000 0000
0000 -00x
0000 0000
0000 0000
0000 -010
0000 0000
Value on:
POR,
BOR
bit7/8
STOP
bit
0000 000u
0000 0000
0000 -00x
0000 0000
0000 0000
0000 -010
0000 0000
Value on
all other
RESETS