PIC16F628A-I/P Microchip Technology, PIC16F628A-I/P Datasheet - Page 92

• Manufacturer Part Number: PIC16F628A-I/P
• Description: IC MCU FLASH 2KX14 EEPROM 18DIP
• Manufacturer: Microchip Technology
• Series: PIC® 16Fr

Specifications of PIC16F628A-I/P

• Program Memory Type: FLASH
• Program Memory Size: 3.5KB (2K x 14)
• Package / Case: 18-DIP (0.300", 7.62mm)
• Core Processor: PIC
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 16
• Eeprom Size: 128 x 8
• Ram Size: 224 x 8
• Voltage - Supply (vcc/vdd): 3 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Processor Series: PIC16F
• Core: PIC
• Data Bus Width: 8 bit
• Data Ram Size: 224 B
• Interface Type: SCI/USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 16
• 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, DM163014, DM164120-4
• Minimum Operating Temperature: - 40 C
• Package: 18PDIP
• Device Core: PIC
• Family Name: PIC16
• Maximum Speed: 20 MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: I3DBF648 - BOARD DAUGHTER ICEPIC3AC162053 - HEADER INTERFACE ICD,ICD2 18DIPACICE0202 - ADAPTER MPLABICE 18P 300 MILAC164010 - MODULE SKT PROMATEII DIP/SOIC
• Data Converters: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

PIC16F627A/628A/648A
13.1
The PIC16F648A EEADR register addresses 256
bytes of data EEPROM. All eight bits in the register
(EEADR<7:0>) are required.
The PIC16F627A/628A EEADR register addresses
only the first 128 bytes of data EEPROM so only seven
of the eight bits in the register (EEADR<6:0>) are
required. The upper bit is address decoded. This
means that this bit should always be ‘0’ to ensure that
the address is in the 128 byte memory space.
REGISTER 13-3:
DS40044G-page 92
EEADR
bit 7-4
bit 3
bit 2
bit 1
bit 0
EECON1 – EEPROM CONTROL REGISTER 1 (ADDRESS: 9Ch)
bit 7
Unimplemented: Read as ‘0’
WRERR: EEPROM Error Flag bit
1 = A write operation is prematurely terminated (any MCLR Reset, any WDT Reset during
0 = The write operation completed
WREN: EEPROM Write Enable bit
1 = Allows write cycles
0 = Inhibits write to the data EEPROM
WR: Write Control bit
1 = initiates a write cycle. (The bit is cleared by hardware once write is complete. The WR bit
0 = Write cycle to the data EEPROM is complete
RD: Read Control bit
1 = Initiates an EEPROM read (read takes one cycle. RD is cleared in hardware. The RD bit
0 = Does not initiate an EEPROM read
Legend:
R = Readable bit
-n = Value at POR
U-0
—
normal operation or BOR Reset)
can only be set (not cleared) in software.
can only be set (not cleared) in software).
U-0
—
U-0
—
W = Writable bit
‘1’ = Bit is set
U-0
—
13.2
EECON1 is the control register with four low order bits
physically implemented. The upper-four bits are non-
existent and read as ‘0’s.
Control bits RD and WR initiate read and write,
respectively. These bits cannot be cleared, only set, in
software. They are cleared in hardware at completion
of the read or write operation. The inability to clear the
WR bit in software prevents the accidental, premature
termination of a write operation.
The WREN bit, when set, will allow a write operation.
On power-up, the WREN bit is clear. The WRERR bit is
set when a write operation is interrupted by a MCLR
Reset or a WDT Time-out Reset during normal
operation. In these situations, following Reset, the user
can check the WRERR bit and rewrite the location. The
data and address will be unchanged in the EEDATA
and EEADR registers.
Interrupt flag bit EEIF in the PIR1 register is set when
write is complete. This bit must be cleared in software.
EECON2 is not a physical register. Reading EECON2
will read all ‘0’s. The EECON2 register is used
exclusively in the data EEPROM write sequence.
EECON1 and EECON2 Registers
WRERR
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-x
WREN
R/W-0
© 2009 Microchip Technology Inc.
x = Bit is unknown
R/S-0
WR
R/S-0
RD
bit 0