MCP98242-BESLASHST datasheet(35/52 Pages) MICROCHIP

35 / 52 page

DS21996C-page 35

MCP98242

5.3.4

READ OPERATION

Read operations are initiated in the same way as write

operations, with the exception that the R/W bit of the

slave address is set to ‘1’. There are three basic types

of read operations: current address read, random read,

and sequential read.

TABLE 5-5:

DEVICE RESPONSE WHEN READING SWP/CWP/PWP

5.3.4.1

Current Address Read

The MCP98242 contains an address counter that

maintains the address of the last word accessed,

internally incremented by ‘1’. Therefore, if the previous

access (either a read or write operation) was to

address

n, the next current address read operation

would access data from address

n+1. Upon receipt of

the slave address with R/W bit set to ‘1’, the MCP98242

issues an acknowledge and transmits the 8-bit data

word. The master will not acknowledge (NAK) the

transfer but does generate a Stop condition and the

MCP98242 discontinues transmission (Figure 5-15).

FIGURE 5-15:

Reading Current Word Address (See Section 4.0 “Serial Communication”).

Status

Command

ACK

Address

ACK

Data Byte

ACK

Not Protected

SWP/CWP/PWP

ACK

NoACK

Protected with SWP

SWP

NoACK

CWP

ACK

NoACK

PWP

ACK

NoACK

Permanently Protected

SWP/CWP/PWP

NoACK

Note:

X is defined as ‘don’t care’.

567

Address Byte

Current Word Address

MCP98242

Master

SDA

SCLK

Note:

In this example, the current word address is the

previously accessed address location n plus 1.

MCP98242-BE/ST датащи(PDF) 35 Page - Microchip Technology

MCP98242-BE/ST датащи(HTML) 35 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

датащи скачать

ссылки URL