PIC18LF6310T-I/PT Microchip Technology, PIC18LF6310T-I/PT Datasheet - Page 226

• Manufacturer Part Number: PIC18LF6310T-I/PT
• Description: IC,MICROCONTROLLER,8-BIT,PIC CPU,CMOS,TQFP,64PIN,PLASTIC
• Manufacturer: Microchip Technology
• Series: PIC® 18Fr

Specifications of PIC18LF6310T-I/PT

• Rohs Compliant: YES
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, HLVD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Ram Size: 768 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TFQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

implemented in software and stored as the 9th data bit.
PIC18F6310/6410/8310/8410
18.2
The Asynchronous mode of operation is selected by
clearing the SYNC bit (TXSTA1<4>). In this mode, the
EUSART uses standard Non-Return-to-Zero (NRZ) for-
mat (one Start bit, eight or nine data bits and one Stop bit).
The most common data format is 8 bits. An on-chip dedi-
cated 8-bit/16-bit Baud Rate Generator can be used to
derive standard baud rate frequencies from the oscillator.
The EUSART transmits and receives the LSb first. The
EUSART’s transmitter and receiver are functionally
independent, but use the same data format and baud
rate. The Baud Rate Generator produces a clock, either
x16 or x64 of the bit shift rate depending on the BRGH
and BRG16 bits (TXSTA1<2> and BAUDCON1<3>).
Parity is not supported by the hardware but can be
The
(BAUDCON<5>) bits allow the TX and RX signals to be
inverted (polarity reversed). Devices that buffer signals
between TTL and RS-232 levels also invert the signal.
Setting the TXCKP and RXDTP bits allows for the use of
circuits that provide buffering without inverting the signal.
When operating in Asynchronous mode, the EUSART
module consists of the following important elements:
• Baud Rate Generator
• Sampling Circuit
• Asynchronous Transmitter
• Asynchronous Receiver
• Auto-Wake-up on Sync Break Character
• 12-Bit Break Character Transmit
• Auto-Baud Rate Detection
18.2.1
The EUSART transmitter block diagram is shown in
Figure
(Serial) Shift register (TSR). The Shift register obtains
its data from the Read/Write Transmit Buffer register,
TXREG1. The TXREG1 register is loaded with data in
software. The TSR register is not loaded until the Stop
bit has been transmitted from the previous load. As
soon as the Stop bit is transmitted, the TSR is loaded
with new data from the TXREG1 register (if available).
Once the TXREG1 register transfers the data to the
TSR register (occurs in one T
is empty and the TX1IF flag bit (PIR1<4>) is set. This
DS39635C-page 226
18-3. The heart of the transmitter is the Transmit
TXCKP
EUSART Asynchronous Mode
EUSART ASYNCHRONOUS
TRANSMITTER
(BAUDCON<4>)
CY
), the TXREG1 register
and
RXDTP
interrupt can be enabled or disabled by setting or clear-
ing the interrupt enable bit, TX1IE (PIE1<4>). TX1IF
will be set regardless of the state of TX1IE; it cannot be
cleared in software. TX1IF is also not cleared immedi-
ately upon loading TXREG1, but becomes valid in the
second instruction cycle following the load instruction.
Polling TX1IF immediately following a load of TXREG1
will return invalid results.
While TX1IF indicates the status of the TXREG1 regis-
ter, another bit, TRMT (TXSTA1<1>), shows the status
of the TSR register. TRMT is a read-only bit which is set
when the TSR register is empty. No interrupt logic is tied
to this bit so the user has to poll this bit in order to deter-
mine if the TSR register is empty. The TXCKP bit
(BAUDCON<4>) allows the TX signal to be inverted
(polarity reversed). Devices that buffer signals from TTL
to RS-232 levels also invert the signal (when TTL = 1,
RS-232 = negative). Inverting the polarity of the TXx pin
data by setting the TXCKP bit allows for use of circuits
that provide buffering without inverting the signal.
To set up an Asynchronous Transmission:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Note 1: The TSR register is not mapped in data
Initialize the SPBRGH:SPBRG registers for the
appropriate baud rate. Set or clear the BRGH
and BRG16 bits, as required, to achieve the
desired baud rate.
Enable the asynchronous serial port by clearing
bit, SYNC, and setting bit, SPEN.
If the signal from the TXx pin is to be inverted,
set the TXCKP bit.
If interrupts are desired, set enable bit, TXIE.
If 9-bit transmission is desired, set transmit bit,
TX9. Can be used as an address/data bit.
Enable the transmission by setting bit, TXEN,
which will also set bit, TXIF.
If 9-bit transmission is selected, the ninth bit
should be loaded in bit, TX9D.
Load data to the TXREG register (starts
If using interrupts, ensure that the GIE and PEIE
bits in the INTCON register (INTCON<7:6>) are
set.
transmission).
2: Flag bit, TX1IF, is set when enable bit,
memory so it is not available to the user.
TXEN, is set.
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