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2011-2015 Microchip Technology Inc.
DS40001609E-page 233
PIC16(L)F1508/9
22.3
Register Definitions: EUSART Control
REGISTER 22-1:
TXSTA: TRANSMIT STATUS AND CONTROL REGISTER
R/W-/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R/W-0/0
R-1/1
R/W-0/0
CSRC
TX9
TXEN
(1)
SYNC
SENDB
BRGH
TRMT
TX9D
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
x = Bit is unknown
-n/n = Value at POR and BOR/Value at all other Resets
‘1’ = Bit is set
‘0’ = Bit is cleared
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)
bit 6
TX9:
9-bit Transmit Enable bit
1
= Selects 9-bit transmission
0
= Selects 8-bit transmission
bit 5
TXEN:
Transmit Enable bit
(1)
1
= Transmit enabled
0
= Transmit disabled
bit 4
SYNC:
EUSART Mode Select bit
1
= Synchronous mode
0
= Asynchronous mode
bit 3
SENDB:
Send Break Character bit
Asynchronous mode:
1
= Send Sync Break on next transmission (cleared by hardware upon completion)
0
= Sync Break transmission completed
Synchronous mode:
Don’t care
bit 2
BRGH:
High Baud Rate Select bit
Asynchronous mode:
1
= High speed
0
= Low speed
Synchronous mode:
Unused in this mode
bit 1
TRMT:
Transmit Shift Register Status bit
1
= TSR empty
0
= TSR full
bit 0
TX9D:
Ninth bit of Transmit Data
Can be address/data bit or a parity bit.
Note 1:
SREN/CREN overrides TXEN in Sync mode.
Содержание PIC12F1501
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