![Microchip Technology PIC16C63A Скачать руководство пользователя страница 71](http://html1.mh-extra.com/html/microchip-technology/pic16c63a/pic16c63a_operators-manual_1785772071.webp)
2000 Microchip Technology Inc.
DS30605C-page 71
PIC16C63A/65B/73B/74B
Steps to follow when setting up an Asynchronous
Reception:
1.
Initialize the SPBRG register for the appropriate
baud rate. If a high speed baud rate is desired,
set bit BRGH. (Section 11.1).
2.
Enable the asynchronous serial port by clearing
bit SYNC, and setting bit SPEN.
3.
If interrupts are desired, set interrupt enable bits
RCIE (PIE1<5>), PEIE (INTCON<6>), and GIE
(INTCON<7>), as required.
4.
If 9-bit reception is desired, then set bit RX9.
5.
Enable the reception by setting bit CREN.
6.
Flag bit RCIF will be set when reception is com-
plete and an interrupt will be generated if enable
bit RCIE was set.
7.
Read the RCSTA register to get the ninth bit (if
enabled) and determine if any error occurred
during reception.
8.
Read the 8-bit received data by reading the
RCREG register.
9.
If any error occurred, clear the error by clearing
enable bit CREN.
FIGURE 11-5:
ASYNCHRONOUS RECEPTION
TABLE 11-4:
REGISTERS ASSOCIATED WITH ASYNCHRONOUS RECEPTION
START
bit
bit7/8
bit1
bit0
bit7/8
bit0
STOP
bit
START
bit
START
bit
bit7/8
STOP
bit
RX (pin)
reg
Rcv buffer reg
Rcv shift
Read Rcv
buffer reg
RCREG
RCIF
(interrupt flag)
OERR bit
CREN
Word 1
RCREG
Word 2
RCREG
STOP
bit
Note:
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. An overrun error indicates an error in user’s firmware.
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on:
POR,
BOR
Value on
all other
RESETS
0Bh,8Bh
INTCON
GIE
PEIE
T0IE
INTE
RBIE
T0IF
INTF
RBIF
0000 000x
0000 000u
0Ch
PIR1
PSPIF
(1)
ADIF
(2)
RCIF
TXIF
SSPIF
CCP1IF
TMR2IF
TMR1IF
0000 0000
0000 0000
18h
RCSTA
SPEN
RX9
SREN
CREN
—
FERR
OERR
RX9D
0000 -00x
0000 -00x
1Ah
RCREG USART Receive register
0000 0000
0000 0000
8Ch
PIE1
PSPIE
(1)
ADIE
(2)
RCIE
TXIE
SSPIE
CCP1IE
TMR2IE
TMR1IE
0000 0000
0000 0000
98h
TXSTA
CSRC
TX9
TXEN
SYNC
—
BRGH
TRMT
TX9D
0000 -010
0000 -010
99h
SPBRG
Baud Rate Generator register
0000 0000
0000 0000
Legend:
u
= unchanged,
x
= unknown, - = unimplemented locations read as '0'.
Shaded cells are not used for asynchronous reception.
Note
1:
Bits PSPIE and PSPIF are reserved on the PIC16C73/73A/76; always maintain these bits clear.
2: Bits ADIE and ADIF are reserved on the PIC16C63A/65B; always maintain these bits clear.
Содержание PIC16C63A
Страница 4: ...PIC16C63A 65B 73B 74B DS30605C page 4 2000 Microchip Technology Inc NOTES ...
Страница 6: ...PIC16C63A 65B 73B 74B DS30605C page 6 2000 Microchip Technology Inc NOTES ...
Страница 8: ...PIC16C63A 65B 73B 74B DS30605C page 8 2000 Microchip Technology Inc NOTES ...
Страница 28: ...PIC16C63A 65B 73B 74B DS30605C page 28 2000 Microchip Technology Inc NOTES ...
Страница 42: ...PIC16C63A 65B 73B 74B DS30605C page 42 2000 Microchip Technology Inc NOTES ...
Страница 78: ...PIC16C63A 65B 73B 74B DS30605C page 78 2000 Microchip Technology Inc NOTES ...
Страница 112: ...PIC16C63A 65B 73B 74B DS30605C page 112 2000 Microchip Technology Inc NOTES ...
Страница 152: ...PIC16C63A 65B 73B 74B DS30605C page 152 2000 Microchip Technology Inc NOTES ...
Страница 164: ...PIC16C63A 65B 73B 74B DS30605C page 164 2000 Microchip Technology Inc NOTES ...
Страница 174: ...PIC16C63A 65B 73B 74B DS30605C page 174 2000 Microchip Technology Inc NOTES ...
Страница 178: ...PIC16C63A 65B 73B 74B DS30605C page 178 2000 Microchip Technology Inc NOTES ...
Страница 179: ... 2000 Microchip Technology Inc DS30605C page 179 PIC16C63A 65B 73B 74B NOTES ...
Страница 180: ...PIC16C63A 65B 73B 74B DS30605C page 180 2000 Microchip Technology Inc NOTES ...
Страница 181: ... 2000 Microchip Technology Inc DS30605C page 181 PIC16C63A 65B 73B 74B NOTES ...
Страница 182: ...PIC16C63A 65B 73B 74B DS30605C page 182 2000 Microchip Technology Inc NOTES ...
Страница 183: ... 2000 Microchip Technology Inc DS30605C page 183 PIC16C63A 65B 73B 74B NOTES ...