DS28E05 데이터 시트보기 (PDF) - Maxim Integrated

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DS28E05

1-Wire EEPROM

Maxim Integrated 

DS28E05

1-Wire EEPROM

Write Memory [55h]

The Write Memory command is used to program one or more contiguous 2-byte segments of a memory page. This com-

mand is applicable only to memory locations that are not write protected. The parameter byte specifies the page and

segment number where the writing begins. The new segment data is transmitted in the sequence B0, B1. Table 2 shows

the how these bytes map to the addressed memory page. The command flow allows writing one or multiple adjacent

segments within a page. To safeguard against transmission errors, the DS28E05 supports read-after-write verification.

In case of data error, the master aborts the command by issuing a 1-Wire reset. To start the transfer to EEPROM the

master must transmit a release byte (FFh). After the programming time is over, the DS28E05 transmits a CS byte. If a

page is in EPROM emulation mode, the new segment data is the bitwise AND of the segment data in memory and the

new data provided with the command.

Write Memory

Command Code

Parameter Byte

Restrictions

Protocol Variations

Error conditions

CS Byte

55h

Target page selection, starting segment number (Table 3).

The memory page must not be write protected.

Writing within a page.

Writing through the end of the page.

Invalid parameter byte.

The memory page is write protected.

AAh = success.

33h = The command failed because the page is write protected.

Table 3. Parameter Byte Bitmap

BIT 7

BIT 6

BIT 5

BIT 4

BIT 3

BIT 2

0

PAGE #

SEG #

Note: The bits marked as 0 must be transmitted as 0 for the parameter byte to be valid.

BIT 1

BIT 0

0

Bits 6:4: Memory Page Selection (PAGE #). These bits specify the memory page that is to be written to. Valid memory

page numbers are 000b (page 0) to 111b (page 7).

Bits 3:1: Starting Segment Selection (SEG #). These bits specify the location within the selected memory page where

the writing begins. For pages 0 to 6 valid segment numbers are 000b (start of memory page) to 111b (last segment of

memory page). Valid segment numbers for page 7 are 000b, 001b, and 010b.

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