參數(shù)資料
型號： PIC16CR7X
廠商： Microchip Technology Inc.
英文描述： 28/40-Pin, 8-Bit CMOS ROM Microcontrollers
中文描述： 28/40-Pin，8位微控制器的CMOS光盤
文件頁數(shù)： 71/172頁
文件大小： 1506K
代理商： PIC16CR7X
2007 Microchip Technology Inc.
DS21993C-page 69
PIC16CR7X
10.0
UNIVERSAL SYNCHRONOUS
ASYNCHRONOUS RECEIVER
TRANSMITTER (USART)
The Universal Synchronous Asynchronous Receiver
Transmitter (USART) module is one of the two serial
I/O modules. (USART is also known as a Serial
Communications Interface or SCI.) The USART can be
configured as a full duplex asynchronous system that
can communicate with peripheral devices, such as
CRT terminals and personal computers, or it can be
configured as a half duplex synchronous system that
can communicate with peripheral devices, such as A/D
or D/A integrated circuits, serial EEPROMs, etc.
The USART can be configured in the following modes:
Asynchronous (full duplex)
Synchronous – Master (half duplex)
Synchronous – Slave (half duplex)
Bit SPEN (RCSTA<7>) and bits TRISC<7:6> have to be
set in order to configure pins RC6/TX/CK and RC7/
RX/DT as the Universal Synchronous Asynchronous
Receiver Transmitter.
REGISTER 10-1:
TXSTA: TRANSMIT STATUS AND CONTROL (ADDRESS 98h)
R/W-0
CSRC
R/W-0
TX9
R/W-0
TXEN
R/W-0
SYNC
U-0
—
R/W-0
BRGH
R-1
TRMT
R/W-0
TX9D
bit 7
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
CSRC:
Clock Source Select bit
Asynchronous mode:
Don’t care
Synchronous mode:
1
= Master mode (clock generated internally from BRG)
0
= Slave mode (clock from external source)
TX9
: 9-bit Transmit Enable bit
1
= Selects 9-bit transmission
0
= Selects 8-bit transmission
TXEN
: Transmit Enable bit
1
= Transmit enabled
0
= Transmit disabled
Note:
SREN/CREN overrides TXEN in Sync mode
SYNC
: USART Mode Select bit
1
= Synchronous mode
0
= Asynchronous mode
Unimplemented:
Read as ‘
0
’
BRGH
: High Baud Rate Select bit
Asynchronous mode:
1
= High speed
0
= Low speed
Synchronous mode:
Unused in this mode
TRMT
: Transmit Shift Register Status bit
1
= TSR empty
0
= TSR full
TX9D:
9th bit of Transmit Data
Can be parity bit
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
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