CMOS SERIAL E2PROM
S-93A46A/56A/66A
Rev.2.1_00
4.4 Writing to Chip (WRAL)
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”.
tCDS
Standby
CS
SK
Verify
1
2
0
3
4
5
6
7
8
9
10
25
DI
0
0
<1>
1
D15
D0
tSV
tHZ1
4Xs
Hi-Z
busy
ready
DO
Hi-Z
tPR
Figure 10 Chip Write Timing (S-93A46A)
tCDS
Standby
CS
SK
Verify
11 12
D15
27
1
2
0
3
4
5
6
7
8
9
10
DI
0
0
<1>
1
D0
tSV
tHZ1
6Xs
Hi-Z
busy
ready
DO
Hi-Z
tPR
Figure 11 Chip Write Timing (S-93A56A/66A)
14
Seiko Instruments Inc.
SII [ SEIKO INSTRUMENTS INC ]
