ST93C57CB6 データシートの表示（PDF） - Microchip Technology

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ST93C57CB6

2K (128 x 16 or 256 x 8) SERIAL MICROWIRE EEPROM

Microchip Technology 

Figure 6. READ, WRITE, EWEN, EWDS Sequences

ST93C56/56C, ST93C57C

READ

S

D

Q

WRITE

S

D

Q

ERASE

S

WRITE

ENABLE

D

1 1 0 An A0

Qn

Q0

ADDR

OP

CODE

DATA OUT

1 0 1 An A0 Dn

CHECK

STATUS

D0

ADDR

OP

CODE

1 0 0 1 1 Xn X0

OP

CODE

DATA IN

BUSY

READY

ERASE S

WRITE

DISABLE

D

1 0 0 0 0 Xn X0

OP

CODE

AI00878C

Notes: 1. An: n = 7 for x16 org. and 8 for x8 org.

2. Xn: n = 5 for x16 org. and 6 for x8 org.

(Q = 0) will be returned if S is driven high, and the

ST93C56 will ignore any data on the bus. When the

write cycle is completed, the Ready signal (Q = 1)

will indicate (if S is driven high) that the ST93C56

is ready to receive a new instruction. Programming

is internally self-timed (the external clock signal on

C input may be disconnected or left running after

the start of a programming cycle) and does not

require an Erase instruction prior to the Write in-

struction (The Write instruction includes an auto-

matic erase cycle before programing data).

7/13

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