S-93C56A SII [Seiko Instruments Inc], S-93C56A Datasheet - Page 14

• Manufacturer Part Number: S-93C56A
• Description: CMOS SERIAL E2PROM
• Manufacturer: SII [Seiko Instruments Inc]

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operation, in order to accept the next command by having CS go high, the DO pin switch from a state of high-impedence to
a state of data output; but if it recognizes a start-bit, the DO pin returns to a state of high-impedence.
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also a possibility by connecting DI and DO. However, since there is a possibility that the DO output from the serial memory
IC will interfere with the data output from the CPU with a 3-wire interface, install a resistor between DI and DO in order to
give preference to data output from the CPU to DI(See Figure 22).
Both the recognition of a start-bit and the VERIFY procedure occur when CS is
Although the normal configuration of a serial interface is a 4-wire interface to CS, SK, DI, and DO, a 3-wire interface is
Receiving a Start-Bit
Three-wire Interface (DI-DO direct connection)
CPU
Seiko Instruments Inc.
SIO
Figure 22
R : 10k
S-93C46A/56A/66A
100k
DI
DO
“
high
CMOS SERIAL E
”
. Therefore, only after a write
S-93C46A/56A/66A
2
PROM
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