PIC16F873-04I/SO Microchip Technology, PIC16F873-04I/SO Datasheet - Page 120

• Manufacturer Part Number: PIC16F873-04I/SO
• Description: IC MCU FLASH 4KX14 EE 28SOIC
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F873-04I/SO

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Core Processor: PIC
• Speed: 4MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Type: FLASH
• Eeprom Size: 128 x 8
• Ram Size: 192 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 5x10b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC (7.5mm Width)
• Controller Family/series: PIC16F
• No. Of I/o's: 22
• Eeprom Memory Size: 128Byte
• Ram Memory Size: 192Byte
• Cpu Speed: 4MHz
• No. Of Timers: 3
• Package: 28SOIC W
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 4 MHz
• Operating Supply Voltage: 5 V
• Data Bus Width: 8 Bit
• Number Of Programmable I/os: 22
• Interface Type: I2C/SPI/USART
• On-chip Adc: 5-chx10-bit
• Number Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT28SO-1 - SOCKET TRANSITION 28SOIC 300MIL309-1073 - ADAPTER 28-SOIC TO 28-SOIC309-1024 - ADAPTER 28-SOIC TO 28-DIP309-1023 - ADAPTER 28-SOIC TO 28-DIP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PICmicro MID-RANGE MCU FAMILY
7.11
DS31007A-page 7-8
Design Tips
Question 1:
Answer 1:
There are a few possibilities, but the most likely is that you did not exactly follow the write
sequence as shown in
are disabled during this sequence.
Question 2:
Answer 2:
The data will only change when a Data EEPROM write occurs. Inadvertent writes may occur
when the device is in a brown-out condition (out of operating specification) and the device is not
being forced to the reset state. During a brown-out, either the internal brown-out circuitry should
be enabled (when available) or external circuitry should be used to reset the PICmicro MCU to
ensure that no data EEPROM writes occur when the device is out of the valid operating range.
Why do the data EEPROM locations not contain the data that I wrote?
Why is the data in the data EEPROM is getting corrupted?
Example
7-2. If you are using this code segment ensure that all interrupts
1997 Microchip Technology Inc.