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PIC16F628AESS Scheda tecnica(PDF) 81 Page - Microchip Technology

Il numero della parte PIC16F628AESS
Spiegazioni elettronici  Flash-Based, 8-Bit CMOS Microcontrollers with nanoWatt Technology
PDF  180 Pages
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Produttore elettronici  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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PIC16F628AESS Scheda tecnica(HTML) 81 Page - Microchip Technology

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© 2005 Microchip Technology Inc.
DS40044D-page 79
PIC16F627A/628A/648A
FIGURE 12-3:
ASYNCHRONOUS TRANSMISSION (BACK TO BACK)
TABLE 12-6:
REGISTERS ASSOCIATED WITH ASYNCHRONOUS TRANSMISSION
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on
POR
Value on
all other
Resets
0Ch
PIR1
EEIF
CMIF
RCIF
TXIF
—
CCP1IF
TMR2IF
TMR1IF
0000 -000
0000 -000
18h
RCSTA
SPEN
RX9
SREN
CREN
ADEN
FERR
OERR
RX9D
0000 000x
0000 000x
19h
TXREG USART Transmit Data Register
0000 0000
0000 0000
8Ch
PIE1
EEIE
CMIE
RCIE
TXIE
—
CCP1IE
TMR2IE
TMR1IE
0000 -000
0000 -000
98h
TXSTA
CSRC
TX9
TXEN
SYNC
—
BRGH
TRMT
TX9D
0000 -010
0000 -010
99h
SPBRG Baud Rate Generator Register
0000 0000
0000 0000
Legend:
x
= unknown, - = unimplemented locations read as ‘0’.
Shaded cells are not used for Asynchronous Transmission.
Transmit Shift Reg.
Write to TXREG
BRG output
(shift clock)
RB2/TX/CK (pin)
TXIF bit
(interrupt reg. flag)
TRMT bit
(Transmit shift
reg. empty flag)
Word 1
Word 2
Word 1
Word 2
Start bit
Stop bit
Start bit
Transmit Shift Reg.
Word 1
Word 2
bit 0
bit 1
bit 7/8
bit 0
.
Note:
This timing diagram shows two consecutive transmissions.



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