Collection of Product FAQs
Author: Kano Tomoo
Date: 98/11/12 (Thursday) 10:17 (modified: 99/01/13(Wednesday))
<Information level>
A:
Public (Printing O.K.)
D: Technical Terms
Index:
<Product>
Division name: 01 IC
Category 1:
12 Memory
Category 2:
Cal No.:
2. Serial EEPROM
Overall
Related documents:
Question:
What are the basic operation codes?
Answer:
[Terms required to understand EEPROM data sheets (1)] Basic commands
-
-
-
-
-
-
Data read, READ
Reads data from a specified address
Data write, WRITE or PROGRAM
Writes data to a specified address
Data erase, ERASE
Erases data at a specified address (all “1”’s)
Chip write, WRAL
Writes the same (word) data in all address spaces
Chip erase, ERAL
Erases data in all address spaces (all “1”’s)
Program disable, EWDS or PDS
Prohibits write operations (WRITE), and prevents false-writes caused by noise or uncontrollable
running of the CPU
-
Program enable, EWES or PEN
Enables write operations (WRITE)
[Note]
When the power to the EEPROM is turned on, the internal circuit of the IC is reset and the program
disable mode is entered. Thus, following power-on, the program enable command must be entered in
order to write data.
48
SII [ SEIKO INSTRUMENTS INC ]
