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M93C06-RMN6 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
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M93C06-RMN6 Datasheet PDF : 30 Pages
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M93C86, M93C76, M93C66, M93C56, M93C46, M93C06
Figure 5. READ, WRITE, EWEN, EWDS Sequences
READ
S
D
1 1 0 An A0
Q
WRITE
S
D
Qn
Q0
ADDR
OP
CODE
DATA OUT
1 0 1 An A0 Dn
CHECK
STATUS
D0
Q
ERASE
S
WRITE
ENABLE
D
ADDR
OP
CODE
1 0 0 1 1 Xn X0
DATA IN
BUSY
READY
ERASE S
WRITE
DISABLE
D
1 0 0 0 0 Xn X0
OP
CODE
OP
CODE
AI00878C
Note: For the meanings of An, Xn, Qn and Dn, see Table 4, Table 5 and Table 6.
Read
Erase/Write Enable and Disable
The Read Data from Memory (READ) instruction
outputs serial data on Serial Data Output (Q).
When the instruction is received, the op-code and
address are decoded, and the data from the mem-
ory is transferred to an output shift register. A dum-
my 0 bit is output first, followed by the 8-bit byte or
the 16-bit word, with the most significant bit first.
Output data changes are triggered by the rising
edge of Serial Clock (C). The M93Cx6 automati-
cally increments the internal address register and
clocks out the next byte (or word) as long as the
Chip Select Input (S) is held High. In this case, the
dummy 0 bit is not output between bytes (or
words) and a continuous stream of data can be
read.
The Erase/Write Enable (EWEN) instruction en-
ables the future execution of erase or write instruc-
tions, and the Erase/Write Disable (EWDS)
instruction disables it. When power is first applied,
the M93Cx6 initializes itself so that erase and write
instructions are disabled. After an Erase/Write En-
able (EWEN) instruction has been executed, eras-
ing and writing remains enabled until an Erase/
Write Disable (EWDS) instruction is executed, or
until VCC falls below the power-on reset threshold
voltage. To protect the memory contents from ac-
cidental corruption, it is advisable to issue the
Erase/Write Disable (EWDS) instruction after ev-
ery write cycle. The Read Data from Memory
(READ) instruction is not affected by the Erase/
Write Enable (EWEN) or Erase/Write Disable
(EWDS) instructions.
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