s-93c46a Seiko Instruments Inc., s-93c46a Datasheet - Page 44

• Manufacturer Part Number: s-93c46a
• Description: Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

Collection of Product FAQs
Author: Kano Tomoo
<Information level>
<Product>
Related documents:
Question:
Answer:
A:
Index:
Division name: 01 IC
Category 1:
Category 2:
Cal. No.:
What about the basic terms (memory protect, reset, CS)?
Memory protect, reset
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)
Malfunction, however, is likely to be caused by noise upon power-on if a command is executed at the
GND level.
DO
CS
SK
DI
/CS is useful on the interface of the microcomputer (L active is mainly used for the microcomputer).


1
1
2
0
3
0
4
0
5
Public (Printing O.K.)
D (Technical terms)
12 Memory
2. Serial EEPROM
Overall
X
6
X
7
X
8
A
9
7
*
A
Hi-Z
10
6
*
A
S-29xx1A, S-29x94A, S-29x55A
11
5
A
12
4
A
Date: 98/11/12 (Thursday) 10:17 (modified: 99/01/13)
13
3
A
14
2
A
15
1
A
16
0
D
17
1
D
18
1
D
19
1
43
29
D
A
30
2
7
A
D
6
31
A
1
5
D
A
32
0
4
A
D
3
33
1
A
2
D
A
34
1
1
A
D
0
+1
1
45
D
46
A
2
7
A
D
47
6
1
A
D
5
A
48
0
4
A
D
49
3
1
A
D
2
A
50
1
1
A
D
0
1
+2
Hi
-
Z