PIC16F877-20/P Microchip Technology, PIC16F877-20/P Datasheet - Page 118

• Manufacturer Part Number: PIC16F877-20/P
• Description: IC MCU FLASH 8KX14 EE 40DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F877-20/P

• Core Size: 8-Bit
• Program Memory Size: 14KB (8K x 14)
• Core Processor: PIC
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 33
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 368 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Controller Family/series: PIC16F
• No. Of I/o's: 33
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 368Byte
• Cpu Speed: 20MHz
• No. Of Timers: 3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: 444-1001 - DEMO BOARD FOR PICMICRO MCU
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

PICmicro MID-RANGE MCU FAMILY
7.7
DS31007A-page 7-6
Write Verify
Depending on the application, good programming practice may dictate that the value written to
the Data EEPROM be verified
should be used in applications where an EEPROM bit will be stressed near the specification limit.
The Total Endurance disk will help determine your comfort level.
Example 7-3: Write Verify
READ
;
; Is the value written (in W reg) and read (in EEDATA) the same?
;
BCF
:
:
MOVF
BSF
BSF
BCF
SUBWF EEDATA, W
BTFSS STATUS, Z
GOTO
:
:
STATUS, RP0 ; Bank0
EEDATA, W
STATUS, RP0 ; Bank1
EECON1, RD
STATUS, RP0 ; Bank0
WRITE_ERR
(Example
; Any code can go here
;
; Must be in Bank0
; YES, Read the value written
;
; Is difference 0?
; NO, Write error
; YES, Good write
; Continue program
7-3) as the value that was intended to be written. This
1997 Microchip Technology Inc.