PIC16F777-I/PT Microchip Technology, PIC16F777-I/PT Datasheet - Page 349

• Manufacturer Part Number: PIC16F777-I/PT
• Description: IC PIC MCU FLASH 8KX14 44TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F777-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 14KB (8K x 14)
• Package / Case: 44-TQFP, 44-VQFP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 36
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 14x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 368 B
• Interface Type: AUSART, CCP, I2C, MSSP, SPI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 36
• Number Of Timers: 3
• Operating Supply Voltage: 4 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: 52715-96, 52716-328, 52717-734
• Development Tools By Supplier: ICE2000, DM163022
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT44PT3 - SOCKET TRAN ICE 44MQFP/TQFPI3DBF777 - BOARD DAUGHTER ICEPIC3AC164305 - MODULE SKT FOR PM3 44TQFP444-1001 - DEMO BOARD FOR PICMICRO MCUAC164020 - MODULE SKT PROMATEII 44TQFP
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

18.4.3
18.4.3.1
1997 Microchip Technology Inc.
(RX/DT pin)
(RX/DT pin)
baud CLK
baud CLK
Sampling
Device Exceptions
x16 CLK
x16 CLK
RX
RX
The data on the RX/DT pin is sampled three times by a majority detect circuit to determine if a
high or a low level is present at the RX pin.
circuit. The sampling operates the same regardless of the state of the BRGH bit, only the source
of the x16 clock is different.
Figure 18-6:
All new devices will use the sampling scheme shown in
tion to the above sampling scheme are:
• PIC16C63
• PIC16C65
• PIC16C65A
• PIC16C73
• PIC16C73A
• PIC16C74
• PIC16C74A
These devices have a sampling circuitry that works as follows. If the BRGH bit (TXSTA<2>) is
clear (i.e., at the low baud rates), the sampling is done on the seventh, eighth and ninth falling
edges of a x16 clock
is done on the 3 clock edges preceding the second rising edge after the first falling edge of a x4
clock
Figure 18-7:
1
1
(Figure 18-8
2
2
3
3
4
4
RX Pin Sampling Scheme, BRGH = 0 or BRGH = 1
RX Pin Sampling Scheme (BRGH = 0)
and
(Figure
5
5
Figure
6
6
18-7). If bit BRGH is set (i.e., at the high baud rates), the sampling
18-9).
7
7
Samples
Samples
8
8
9
9
Start bit
Start bit
Figure 18-6
10
10
Section 18. USART
11
11
Baud CLK for all but start bit
Baud CLK for all but start bit
12
12
Figure
shows the waveform for the sampling
13
13
18-6. Devices that have an excep-
14
14
15
15
16
16
DS31018A-page 18-13
1
1
2
2
Bit0
Bit0
3
3
18