S93A86A Datasheet, PDF (14/39 Pages) Seiko Instruments Inc – 125C OPERATION 3-WIRE SERIAL

125°C OPERATION 3-WIRE SERIAL E²PROM FOR AUTOMOTIVE
S-93A86A
Rev.6.1_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”.
t_CDS
CS
Verify
Standby
SK
1 2 3 4 5 6 7 8 9 10 11 12 13 14
29
DI
<1> 0 0 0
1
DO
High-Z
8Xs
D15
D0
t_SV
t_HZ1
busy
ready
t_PR
High-Z
Figure 9 Chip Write Timing
4. 5 Erasing chip (ERAL)
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 “ Function to Protect Against Write due to Erroneous Instruction Recognition”.
CS
tCDS
SK
1
2
3
4
5
6
7
8
9 10 11 12 13
Verify
Standby
DI
<1> 0
0 10
8Xs
DO
High-Z
t_SV
busy _ready
t_PR
tHZ1
High-Z
Figure 10 Chip Erase Timing
14
Seiko Instruments Inc.