PIC16F1947-I/PT Microchip Technology Inc., PIC16F1947-I/PT Datasheet - Page 306

• Manufacturer Part Number: PIC16F1947-I/PT
• Description: 64 TQFP 10x10x1mm TRAY28KB Flash, 1KB RAM, 256B EEPROM, LCD, 1.8-5.5V
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F1947-I/PT

• A/d Inputs: 17-Channel, 10-Bit
• Comparators: 3
• Cpu Speed: 8 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 54
• Interface: CAN/I2C/SPI/UART/USART
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 64-pin TQFP
• Programmable Memory: 28K Bytes
• Ram Size: 1K Bytes
• Speed: 32 MHz
• Timers: 4-8-bit, 1-16-bit
• Voltage, Range: 1.8-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC16F/LF1946/47
25.2
The factory calibrates the internal oscillator block
output
frequency may drift as V
and this directly affects the asynchronous baud rate.
Two methods may be used to adjust the baud rate
clock, but both require a reference clock source of
some kind.
REGISTER 25-1:
DS41414B-page 306
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-0
CSRC
(HFINTOSC).
Clock Accuracy with
Asynchronous Operation
SREN/CREN overrides TXEN in Sync mode.
CSRC: Clock Source Select bit
Asynchronous mode:
Don’t care
Synchronous mode:
1 =
0 =
TX9: 9-bit Transmit Enable bit
1 =
0 =
TXEN: Transmit Enable bit
1 = Transmit enabled
0 = Transmit 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 empty
0 = TSR full
TX9D: Ninth bit of Transmit Data
Can be address/data bit or a parity bit.
R/W-0
TX9
Master mode (clock generated internally from BRG)
Slave mode (clock from external source)
Selects 9-bit transmission
Selects 8-bit transmission
TXxSTA: TRANSMIT STATUS AND CONTROL REGISTER
However,
DD
or temperature changes,
W = Writable bit
‘1’ = Bit is set
TXEN
R/W-0
the
(1)
(1)
HFINTOSC
R/W-0
SYNC
Preliminary
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
SENDB
R/W-0
The first (preferred) method uses the OSCTUNE
register to adjust the HFINTOSC output. Adjusting the
value in the OSCTUNE register allows for fine resolution
changes to the system clock source. See
“Clock Source Types”
The other method adjusts the value in the Baud Rate
Generator. This can be done automatically with the
Auto-Baud
“Auto-Baud
resolution when adjusting the Baud Rate Generator to
compensate for a gradual change in the peripheral
clock frequency.
Detect
Detect”). There may not be fine enough
BRGH
R/W-0
feature
 2010 Microchip Technology Inc.
for more information.
x = Bit is unknown
TRMT
R-1
(see
Section 25.3.1
Section 5.2
R/W-0
TX9D
bit 0