PIC16F874A-I/PT Microchip Technology, PIC16F874A-I/PT Datasheet - Page 506

• Manufacturer Part Number: PIC16F874A-I/PT
• Description: IC MCU FLASH 4K 20MHZ 44-TQFP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F874A-I/PT

• Program Memory Type: FLASH
• Program Memory Size: 7KB (4K 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: 33
• Eeprom Size: 128 x 8
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 192 B
• Interface Type: I2C/SPI/USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 33
• Number Of Timers: 3
• Operating Supply Voltage: 2 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: PG164130, DV164035, DV244005, DV164005, PG164120, ICE2000, DM163022, DV164120
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8-ch x 10-bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT44PT3 - SOCKET TRAN ICE 44MQFP/TQFPAC164305 - MODULE SKT FOR PM3 44TQFP444-1001 - DEMO BOARD FOR PICMICRO MCUAC164020 - MODULE SKT PROMATEII 44TQFP
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PICmicro MID-RANGE MCU FAMILY
27.5
DS31027A-page 27-10
Design Tips
Question 1:
Answer 1:
Nothing. You probably code protected the device. If this is the case, the device is no longer
usable. See Subsection
Question 2:
Answer 2:
1.
2.
Question 3:
Answer 3:
That is by design. Also remember that Microchip does not recommend code protecting windowed
devices.
Did you re-assemble the source file specifying the PIC16C74A in the INCLUDE file and
LIST directives. The use of the CONFIG directive is highly recommended.
On the device programmer, did you specify the PIC16C74A, and were all the configuration
bits as desired?
I have a JW device and I can no longer program it (reads scrambled data or
all '0's). What’s wrong with the device?
In converting from a PIC16C74 to a PIC16C74A, my application no longer
works.
When I erase the device, the program memory is blank but the configura-
tion word is not yet erased.
27.3 “Program Verification/Code Protection”
1997 Microchip Technology Inc.
for more details.