CMOS SERIAL E
2
PROM
S-93A46A/56A/66A
4.2 Writing Data (WRITE)
Rev.2.1
_00
To write 16-bit data to a specified address, change CS to high and then input the WRITE instruction,
address, and 16-bit data following the start bit. 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 have
been input, the clock pulse monitoring circuit cancels the WRITE instruction. For details of the clock
pulse monitoring circuit, refer to “
Function to Protect Against Write due to Erroneous
Instruction Recognition
”.
t
CDS
CS
SK
DI
DO
1
<1>
2
0
1
3
4
A5
5
A4
6
A3
7
A2
8
A1
9
A0
10
D15
25
D0
Verify
Standby
Hi-Z
t
SV
busy
ready
t
HZ1
t
PR
Hi-Z
Figure 6 Data Write Timing (S-93A46A)
t
CDS
CS
SK
DI
DO
1
<1>
2
0
3
1
Hi-Z
4
5
A6
6
A5
7
A4
8
A3
9
A2
10
A1
11
A0
12
D15
27
D0
Verify
Standby
x:S-93A56A
A7:S-93A66
t
SV
busy
ready
t
HZ1
t
PR
Hi-Z
Figure 7 Data Write Timing (S-93A56A/66A)
12
Seiko Instruments Inc.
SII [ SEIKO INSTRUMENTS INC ]
