11AA02E48-ISLASHTT datasheet(9/32 Pages) MICROCHIP

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DS20002122D-page 9

11AA02E48/11AA02E64

4.0

DEVICE COMMANDS

After the device address byte, a command byte must

be sent by the master to indicate the type of operation

to be performed. The code for each instruction is listed

in Table 4-1.

TABLE 4-1:

INSTRUCTION SET

4.1

Read Instruction

The Read command allows the master to access any

memory location in a random manner. After the READ

instruction has been sent to the slave, the two bytes of

the

Word

Address

are

transmitted,

with

Acknowledge sequence being performed after each

byte. Then, the slave sends the first data byte to the

master. If more data is to be read, the master sends a

MAK, indicating that the slave should output the next

data byte. This continues until the master sends a

NoMAK, which ends the operation.

To provide sequential reads in this manner, the

11AA02EXX contains an internal Address Pointer

which is incremented by one after the transmission of

each byte. This Address Pointer allows the entire

memory contents to be serially read during one

operation. When the highest address is reached, the

Address Pointer rolls over to address ‘0x00’ if the

master chooses to continue the operation by providing

a MAK.

FIGURE 4-1:

READ COMMAND SEQUENCE

Instruction Name

Instruction Code

Hex Code

Description

READ

0000 0011

0x03

Read data from memory array beginning at specified address

CRRD

0000 0110

0x06

Read data from current location in memory array

WRITE

0110 1100

0x6C

Write data to memory array beginning at specified address

WREN

1001 0110

0x96

Set the write enable latch (enable write operations)

WRDI

1001 0001

0x91

Reset the write enable latch (disable write operations)

RDSR

0000 0101

0x05

Read STATUS register

WRSR

0110 1110

0x6E

Write STATUS register

ERAL

0110 1101

0x6D

Write ‘0x00’ to entire array

SETAL

0110 0111

0x67

Write ‘0xFF’ to entire array

76 5 4

Data Byte 1

32 1 0

76 5 4

Data Byte 2

32 1 0

76 5 4

Data Byte n

32 1 0

SCIO

Start Header

SCIO

Device Address

Command

Standby Pulse

SCIO

15 14 13 12

Word Address MSB

11 10 9 8

76 5 4

Word Address LSB

32 1 0

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