AS8267 datasheet(79/136 Pages) AMSCO

79 / 136 page

Data Sheet AS8267 / AS8268

Revision 1.0, 19-Jun-07

Page 79 of 136

In order to protect against inadvertent programming the user can see these bits. Please note that the protected

range of EEPROM cannot be overwritten via an SCT command there anymore. Reprogramming must be done

with a dedicated program then.

Instruction Set

Instruction

Name

Instruction

Format

Description

READ

03h

Read data from memory starting with selected address

WRITE

02h

Write data to memory beginning at selected address. Most EEPROMs allow page writing

of pages 16, 32, 64 or even more bytes for faster device programming. Before every

page write operation a WREN instruction must be applied – see also bootloading and

uploading sequence for details.

WREN

06h

Write enable EEPROM, enables write operation

RDSR

05h

Read EEPROM Status register

WRDI

08h

Write disable EEPROM, disable write operation

WRSR

01h

Write EEPROM Status register

SPI Modes

These devices can be driven by a microcontroller with its SPI peripheral running in either of the two following

modes:

CPOL = 0, CPHA = 0

CPOL = 1, CPHA = 1 (It is recommended to set CPOL = 1, CPHA = 1 in your program: The build-in

bootloader uses this setting as well.)

For these two modes, input data is latched in on the rising edge of Serial Clock (SC), and output data is issued

on the falling edge of Serial Clock (SC).

The recommended mode is shown in Figure 11. The clock polarity SC is ‘1’ when the bus master is in Stand-by

mode and not transferring data (idle state):

SC remains at 1 for (CPOL = 1, CPHA = 1)

Figure 11: SPI modes recommended

EEP_SC(in)

EEP_SI(in)

EEP_SO(out

)

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