PIC16F873A-I/SP Microchip Technology, PIC16F873A-I/SP Datasheet - Page 41

• Manufacturer Part Number: PIC16F873A-I/SP
• Description: IC MCU FLASH 4KX14 EE 28DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F873A-I/SP

• Program Memory Type: FLASH
• Program Memory Size: 7KB (4K x 14)
• Package / Case: 28-DIP (0.300", 7.62mm)
• 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: 22
• 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
• 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: 22
• Number Of Timers: 3
• Operating Supply Voltage: 2 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• 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: 10 bit, 5 Channel
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: PIC16F873AI/SP

3.7
There are conditions when the device should not write
to the data EEPROM or Flash program memory. To
protect against spurious writes, various mechanisms
have been built-in. On power-up, WREN is cleared.
Also, the Power-up Timer (72 ms duration) prevents an
EEPROM write.
The write initiate sequence and the WREN bit together
help prevent an accidental write during brown-out,
power glitch or software malfunction.
TABLE 3-1:
 2003 Microchip Technology Inc.
10Ch
10Dh
10Eh
10Fh
18Ch
18Dh
0Dh
8Dh
Legend:
Address
Protection Against Spurious Write
x = unknown, u = unchanged, - = unimplemented, read as ‘0’, q = value depends upon condition.
Shaded cells are not used by data EEPROM or Flash program memory.
EEDATA
EEADR
EEDATH
EEADRH
EECON1
EECON2 EEPROM Control Register 2 (not a physical register)
PIR2
PIE2
Name
REGISTERS/BITS ASSOCIATED WITH DATA EEPROM AND
FLASH PROGRAM MEMORIES
EEPROM/Flash Data Register Low Byte
EEPROM/Flash Address Register Low Byte
EEPGD
Bit 7
—
—
—
—
CMIE
CMIF
Bit 6
—
—
—
EEPROM/Flash Data Register High Byte
Bit 5
—
—
—
—
EEPROM/Flash Address Register High Byte
EEIF
EEIE
Bit 4
—
WRERR
BCLIE
BCLIF
Bit 3
3.8
When the data EEPROM is code-protected, the micro-
controller can read and write to the EEPROM normally.
However, all external access to the EEPROM is
disabled. External write access to the program memory
is also disabled.
When program memory is code-protected, the microcon-
troller can read and write to program memory normally,
as well as execute instructions. Writes by the device may
be selectively inhibited to regions of the memory depend-
ing on the setting of bits WR1:WR0 of the configuration
word (see Section 14.1 “Configuration Bits” for addi-
tional information). External access to the memory is also
disabled.
WREN
Bit 2
—
—
Operation During Code-Protect
Bit 1
WR
—
—
CCP2IF
CCP2IE
PIC16F87XA
Bit 0
RD
xxxx xxxx uuuu uuuu
xxxx xxxx uuuu uuuu
xxxx xxxx ---0 q000
xxxx xxxx ---- ----
x--- x000 ---0 q000
---- ---- ---- ----
-0-0 0--0 -0-0 0--0
-0-0 0--0 -0-0 0--0
Power-on
Value on
Reset
DS39582B-page 39
Value on
all other
Resets