PIC16LF767-I/SS Microchip Technology, PIC16LF767-I/SS Datasheet - Page 140
![IC PIC MCU FLASH 8KX14 28SSOP](/photos/6/81/68119/150-28-ssop_sml.jpg)
PIC16LF767-I/SS
Manufacturer Part Number
PIC16LF767-I/SS
Description
IC PIC MCU FLASH 8KX14 28SSOP
Manufacturer
Microchip Technology
Series
PIC® 16Fr
Specifications of PIC16LF767-I/SS
Core Processor
PIC
Core Size
8-Bit
Speed
10MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
25
Program Memory Size
14KB (8K x 14)
Program Memory Type
FLASH
Ram Size
368 x 8
Voltage - Supply (vcc/vdd)
2 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
28-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Eeprom Size
-
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PIC16F7X7
11.2
In this mode, the AUSART uses standard Non-Return-
to-Zero (NRZ) format (one Start bit, eight or nine data
bits and one Stop bit). The most common data format
is 8 bits. An on-chip, dedicated, 8-bit Baud Rate
Generator can be used to derive standard baud rate
frequencies from the oscillator. The AUSART transmits
and receives the LSb first. The transmitter and receiver
are functionally independent but use the same data for-
mat and baud rate. The Baud Rate Generator produces
a clock, either x16 or x64 of the bit shift rate, depending
on bit BRGH (TXSTA<2>). Parity is not supported by
the hardware but can be implemented in software (and
stored as the ninth data bit). Asynchronous mode is
stopped during Sleep.
Asynchronous mode is selected by clearing bit, SYNC
(TXSTA<4>).
The AUSART asynchronous module consists of the
following important elements:
• Baud Rate Generator
• Sampling Circuit
• Asynchronous Transmitter
• Asynchronous Receiver
11.2.1
The AUSART transmitter block diagram is shown in
Figure 11-1. The heart of the transmitter is the Transmit
(Serial) Shift Register (TSR). The Shift register obtains
its data from the Read/Write Transmit Buffer register,
TXREG. The TXREG 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 TXREG register (if available).
Once the TXREG register transfers the data to the TSR
register (occurs in one T
empty and flag bit, TXIF (PIR1<4>), is set. This
FIGURE 11-1:
DS30498C-page 138
AUSART Asynchronous Mode
AUSART ASYNCHRONOUS
TRANSMITTER
TXIE
Interrupt
TXIF
TXEN
Baud Rate Generator
AUSART TRANSMIT BLOCK DIAGRAM
CY
SPBRG
), the TXREG register is
Baud Rate CLK
MSb
(8)
TX9D
TXREG Register
TSR Register
TX9
8
Data Bus
interrupt can be enabled/disabled by setting/clearing
enable bit, TXIE (PIE1<4>). Flag bit TXIF will be set
regardless of the state of enable bit TXIE and cannot be
cleared in software. It will reset only when new data is
loaded into the TXREG register. While flag bit TXIF
indicates the status of the TXREG register, another bit,
TRMT (TXSTA<1>), shows the status of the TSR
register. Status bit 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
determine if the TSR register is empty.
Transmission is enabled by setting enable bit, TXEN
(TXSTA<5>). The actual transmission will not occur
until the TXREG register has been loaded with data
and the Baud Rate Generator (BRG) has produced a
shift clock (Figure 11-2). The transmission can also be
started by first loading the TXREG register and then
setting enable bit TXEN. Normally, when transmission
is first started, the TSR register is empty. At that point,
transfer to the TXREG register will result in an immedi-
ate transfer to TSR, resulting in an empty TXREG. A
back-to-back transfer is thus possible (Figure 11-3).
Clearing enable bit TXEN during a transmission will
cause the transmission to be aborted and will reset the
transmitter. As a result, the RC6/TX/CK pin will revert
to high-impedance.
In order to select 9-bit transmission, transmit bit, TX9
(TXSTA<6>), should be set and the ninth bit should be
written to TX9D (TXSTA<0>). The ninth bit must be
written before writing the 8-bit data to the TXREG
register. This is because a data write to the TXREG
register can result in an immediate transfer of the data
to the TSR register (if the TSR is empty). In such a
case, an incorrect ninth data bit may be loaded in the
TSR register.
Note 1: The TSR register is not mapped in data
LSb
0
2: Flag bit TXIF is set when enable bit TXEN
TRMT
memory so it is not available to the user.
is set. TXIF is cleared by loading TXREG.
and Control
Pin Buffer
SPEN
2004 Microchip Technology Inc.
RC6/TX/CK pin
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