PIC16F636-I/P Microchip Technology Inc., PIC16F636-I/P Datasheet - Page 75

• Manufacturer Part Number: PIC16F636-I/P
• Description: 14 PIN, 3.5 KB FLASH, 128 RAM, 12 I/O
• Manufacturer: Microchip Technology Inc.

Specifications of PIC16F636-I/P

• Comparators: 2
• Cpu Speed: 5 MIPS
• Eeprom Memory: 256 Bytes
• Input Output: 12
• Memory Type: Flash
• Number Of Bits: 8
• Package Type: 14-pin PDIP
• Programmable Memory: 3.5K Bytes
• Ram Size: 128 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

9.0
The EEPROM data memory is readable and writable
during normal operation (full V
is not directly mapped in the register file space.
Instead, it is indirectly addressed through the Special
Function Registers. There are four SFRs used to read
and write this memory:
• EECON1
• EECON2 (not a physically implemented register)
• EEDAT
• EEADR
EEDAT holds the 8-bit data for read/write and EEADR
holds the address of the EEPROM location being
accessed. PIC16F636/639 has 256 bytes of data
EEPROM and the PIC12F635 has 64 bytes.
REGISTER 9-1:
REGISTER 9-2:
© 2005 Microchip Technology Inc.
DATA EEPROM MEMORY
bit 7-0
bit 7-0
EEDAT – EEPROM DATA REGISTER (ADDRESS: 9Ah)
EEADR – EEPROM ADDRESS REGISTER (ADDRESS: 9Bh)
bit 7
bit 7
EEDATn: Byte Value to Write to or Read From Data EEPROM bits
Legend:
R = Readable bit
- n = Value at POR
EEADR7
EEADR: Specifies 1 of 256 Locations for EEPROM Read/Write Operation bits
Legend:
R = Readable bit
- n = Value at POR
EEDAT7
Note 1: PIC16F636/639 only. Read as ‘0’ on PIC12F635.
R/W-0
R/W-0
DD
(1)
range). This memory
EEDAT6
EEADR6
R/W-0
R/W-0
EEDAT5
EEADR5
PIC12F635/PIC16F636/639
R/W-0
R/W-0
Preliminary
W = Writable bit
‘1’ = Bit is set
W = Writable bit
‘1’ = Bit is set
EEDAT4
EEADR4
R/W-0
R/W-0
The EEPROM data memory allows byte read and write.
A byte write automatically erases the location and
writes the new data (erase before write). The EEPROM
data memory is rated for high erase/write cycles. The
write time is controlled by an on-chip timer. The write
time will vary with voltage and temperature as well as
from chip-to-chip. Please refer to A/C specifications in
Section 15.0 “Electrical Specifications” for exact
limits.
When the data memory is code-protected, the CPU
may continue to read and write the data EEPROM
memory. The device programmer can no longer access
the data EEPROM data and will read zeroes.
Additional information on the data EEPROM is
available in the “PICmicro
Reference Manual” (DS33023).
EEDAT3
EEADR3
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
R/W-0
EEADR2
EEDAT2
R/W-0
R/W-0
®
Mid-Range MCU Family
x = Bit is unknown
x = Bit is unknown
EEADR1
EEDAT1
R/W-0
R/W-0
DS41232B-page 73
EEADR0
EEDAT0
R/W-0
R/W-0
bit 0
bit 0