PIC12F629-I/P Microchip Technology Inc., PIC12F629-I/P Datasheet - Page 50

• Manufacturer Part Number: PIC12F629-I/P
• Description: 8 PIN, 1.75 KB FLASH, 64 RAM, 6 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC12F629-I/P

• Comparators: 1
• Cpu Speed: 5 MIPS
• Eeprom Memory: 128 Bytes
• Input Output: 5
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 8-pin PDIP
• Programmable Memory: 1.75K Bytes
• Ram Size: 64 Bytes
• Speed: 20 MHz
• Timers: 1-8-bit, 1-16-bit
• Voltage, Range: 2-5.5 V
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

PIC12F629/675
8.1
The EEADR register can address up to a maximum of
128 bytes of data EEPROM. Only seven of the eight
bits in the register (EEADR<6:0>) are required. The
MSb (bit 7) is ignored.
The upper bit should always be ‘0’ to remain upward
compatible with devices that have more data EEPROM
memory.
8.2
EECON1 is the control register with four low order bits
physically implemented. The upper four bits are non-
implemented 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
REGISTER 8-3:
DS41190C-page 48
EEADR
EECON1 AND EECON2
REGISTERS
bit 7-4
bit 3
bit 2
bit 1
bit 0
EECON1 — EEPROM CONTROL REGISTER (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:
S = Bit can only be set
R = Readable bit
- n = Value at POR
U-0
normal operation or BOD detect)
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
—
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 opera-
tion. In these situations, following RESET, the user can
check the WRERR bit, clear it, and rewrite the location.
The data and address will be cleared, therefore, the
EEDATA and EEADR registers will need to be re-
initialized.
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.
WRERR
R/W-x
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared
WREN
R/W-0
 2003 Microchip Technology Inc.
x = Bit is unknown
R/S-0
WR
R/S-0
RD
bit 0