PIC16F639-I/SS Microchip Technology, PIC16F639-I/SS Datasheet - Page 54

• Manufacturer Part Number: PIC16F639-I/SS
• Description: IC MCU FLASH 2KX14 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F639-I/SS

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 20-SSOP
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Peripherals: Brown-out Detect/Reset, LVD, POR, WDT
• Number Of I /o: 11
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: SPI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• 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
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: XLT20SS1-1 - SOCKET TRANSITION 20DIP 20SSOPXLT20SS-1 - SOCKET TRANSITION 18DIP 20SSOPAC162066 - HEADER INTRFC MPLAB ICD2 20PINAC164307 - MODULE SKT FOR PM3 28SSOP
• Eeprom Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16F630/676
8.7
Data memory can be code protected by programming
the CPD bit to ‘0’.
When the data memory is code protected, the CPU is
able to read and write data to the Data EEPROM. It is
recommended to code protect the program memory
when code protecting data memory. This prevents
anyone from programming zeroes over the existing
code (which will execute as NOPs) to reach an added
routine, programmed in unused program memory,
which
Programming unused locations to ‘0’ will also help
prevent data memory code protection from becoming
breached.
TABLE 8-1:
DS40039C-page 52
0Ch
9Ah
9Bh
9Ch
9Dh
Legend: x = unknown, u = unchanged, - = unimplemented read as '0', q = value depends upon condition.
Note 1: EECON2 is not a physical register.
Address
outputs
DATA EEPROM OPERATION
DURING CODE PROTECT
Shaded cells are not used by Data EEPROM module.
PIR1
EEDATA
EEADR
EECON1
EECON2
Name
the
REGISTERS/BITS ASSOCIATED WITH DATA EEPROM
(1)
contents
EEPROM Data Register
EEPROM Control Register 2
EEIF
Bit 7
—
—
EEPROM Address Register
ADIF
of
Bit 6
—
data
Bit 5
—
—
memory.
Bit 4
—
—
WRERR WREN
CMIF
Bit 3
Bit 2
—
Bit 1
WR
—
TMR1IF 00-- 0--0 00-- 0--0
Bit 0
 2003 Microchip Technology Inc.
RD
0000 0000 0000 0000
-000 0000 -000 0000
---- x000 ---- q000
---- ---- ---- ----
POR, BOD
Value on
Value on all
RESETS
other