s-93a86a Seiko Instruments Inc., s-93a86a Datasheet - Page 12

• Manufacturer Part Number: s-93a86a
• Description: Cmos Serial E2prom
• Manufacturer: Seiko Instruments Inc.

CS
SK
DO
CS
SK
DO
12
DI
DI
CMOS SERIAL E
S-93A86A
4.4 Writing to Chip (WRAL)
4.5 Erasing Chip (ERAL)
To write the same 16-bit data to the entire memory address space, change CS to high, and then input
the WRAL instruction, an address, and 16-bit data following the start bit. Any address can be input.
The write operation starts when CS goes low. There is no need to set the data to 1 before writing.
When the clocks more than the specified number been input, the clock pulse monitoring circuit
cancels the WRAL instruction. For details of the clock pulse monitoring circuit, refer to “ Function to
Protect Against Write due to Erroneous Instruction Recognition”.
To erase the data of the entire memory address space, set all the data to 1, change CS to high, and
then input the ERAL instruction and an address following the start bit. Any address can be input.
There is no need to input data. The chips erase operation starts when CS goes low. When the clocks
more than the specified number have been input, the clock pulse monitoring circuit cancels the ERAL
instruction. For details of the clock pulse monitoring circuit, refer to “
Write due to Erroneous Instruction Recognition”.
<1>
<1>
1
1
2
0
0
2
0
3
2
3
0
0
PROM
4
Hi-Z
1
4
1
5
0
5
6
7
6
Figure 8 Chip Erase Timing
Figure 7 Chip Write Timing
8Xs
8
7
Seiko Instruments Inc.
8Xs
9
8
10
9
11
10
12
11
13
12
D15
14
13
t
CDS
29
D0
Function to Protect Against
t
SV
t
SV
t
CDS
t
PR
t
PR
busy
Verify
Verify
busy
ready
Rev.2.1
ready
Standby
Standby
Hi-Z
Hi-Z
t
_00
HZ1
t
HZ1