PIC16C65A Microchip Technology, PIC16C65A Datasheet - Page 105
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PIC16C65A
Manufacturer Part Number
PIC16C65A
Description
8-Bit CMOS Microcontrollers
Manufacturer
Microchip Technology
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12.0
The Universal Synchronous Asynchronous Receiver
Transmitter (USART) module is one of the two serial
I/O modules. (USART is also known as a Serial Com-
munications Interface or SCI) The USART can be con-
figured as a full duplex asynchronous system that can
communicate with peripheral devices such as CRT ter-
FIGURE 12-1: TXSTA: TRANSMIT STATUS AND CONTROL REGISTER (ADDRESS 98h)
Applicable Devices
61 62 62A R62 63 R63 64 64A R64 65 65A R65 66 67
1997 Microchip Technology Inc.
bit7
bit 7:
bit 6:
bit 5:
bit 4:
bit 3:
bit 2:
bit 1:
bit 0:
R/W-0
CSRC
UNIVERSAL SYNCHRONOUS
ASYNCHRONOUS RECEIVER
TRANSMITTER (USART)
MODULE
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.
R/W-0
Note:
TX9
For the PIC16C63/R63/65/65A/R65 the asynchronous high speed mode (BRGH = 1) may
experience a high rate of receive errors. It is recommended that BRGH = 0. If you desire a
higher baud rate than BRGH = 0 can support, refer to the device errata for additional infor-
mation or use the PIC16C66/67.
R/W-0
TXEN
R/W-0
SYNC
U-0
—
BRGH
R/W-0
minals and personal computers, or it can be configured
as a half duplex synchronous system that can commu-
nicate with peripheral devices such as A/D or D/A inte-
grated 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 Asynchro-
nous Receiver Transmitter.
TRMT
R-1
R/W-0
TX9D
bit0
W = Writable bit
U = Unimplemented bit,
- n =Value at POR reset
R = Readable bit
PIC16C6X
read as ‘0’
DS30234D-page 105
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