PIC18F25K80 MICROCHIP [Microchip Technology], PIC18F25K80 Datasheet - Page 340

• Manufacturer Part Number: PIC18F25K80
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18F66K80 FAMILY
22.1
The operation of each Enhanced USART module is
controlled through three registers:
• Transmit Status and Control (TXSTAx)
• Receive Status and Control (RCSTAx)
• Baud Rate Control (BAUDCONx)
These are detailed on the following pages in
Register
respectively.
REGISTER 22-1:
DS39977C-page 340
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
Note 1:
R/W-x
CSRC
EUSART Control Registers
22-1,
SREN/CREN overrides TXEN in Sync mode.
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 is enabled
0 = Transmit is disabled
SYNC: EUSART Mode Select bit
1 = Synchronous mode
0 = Asynchronous mode
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.
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 is empty
0 = TSR is full
TX9D: 9th bit of Transmit Data
Can be address/data bit or a parity bit.
Register 22-2
R/W-x
TX9
TXSTAx: TRANSMIT STATUS AND CONTROL REGISTER
W = Writable bit
‘1’ = Bit is set
TXEN
and
R/W-x
(1)
Register
(1)
R/W-x
SYNC
22-3,
Preliminary
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
SENDB
R/W-x
Note:
Throughout this section, references to
register and bit names that may be asso-
ciated with a specific EUSART module are
referred to generically by the use of ‘x’ in
place of the specific module number.
Thus, “RCSTAx” might refer to the
Receive
EUSART1 or EUSART2.
BRGH
R/W-x
Status
 2011 Microchip Technology Inc.
x = Bit is unknown
TRMT
R-x
register
for
R/W-x
TX9D
either
bit 0