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S-93C46A Datasheet, PDF (44/53 Pages) Seiko Instruments Inc – CMOS SERIAL E2PROM
Collection of Product FAQs
Author: Kano Tomoo
Date: 98/11/12 (Thursday) 10:17 (modified: 99/01/13)
<Information level>
A:
Public (Printing O.K.)
Index:
D (Technical terms)
<Product>
Division name: 01 IC
Category 1: 12 Memory
Category 2:
Cal. No.:
2. Serial EEPROM
Overall
Related documents:
Question:
What about the basic terms (memory protect, reset, CS)?
Answer:
Memory protect, reset →S-29xx1A, S-29x94A, S-29x55A
Function for prohibiting a write command from being executed in a certain region of the memory space.
This function is enabled by controlling the protect or reset input pin (select/deselect protect). This reset
prevents the microcomputer from running uncontrollably and also prevents false-writes caused by noise
in order to protect data.
Ex.: Storage of ID codes and product shipment adjustment data
(Note) S-29xx1A and S-29x94A protect 50% of memory, starting with the leading address.
CS, /CS (/CS: S-29x55A, S-29x94A)
CS is an input pin used to select the execution of a command. It is selected using “H” and deselected
using “L” (the reverse is true for /CS)
→ /CS is useful on the interface of the microcomputer (L active is mainly used for the microcomputer).
Malfunction, however, is likely to be caused by noise upon power-on if a command is executed at the
GND level.
CS
SK
DI
DO
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
1
0
0
0X
X
X
A* A* A
7
6
5
A
4
A
3
A
2
A
1
A
0
Hi-Z
D DD
1
1
1
29 30 31 32 33 34
D D DD D D
2
1
0
1
1
1
45 46 47 48 49 50
D DDDD D
2
1
0
1
1
1
Hi-Z
A7A6A5A4A3A2A1A0+1
A7A6A5A4A3A2A1A0+2
43