MCP98244 datasheet(36/52 Pages) MICROCHIP

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MCP98244

DS22327C-page 36

 2012-2013 Microchip Technology Inc.

5.3.5

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.

5.3.5.1

Current Address Read

The MCP98244 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 MCP98244

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

MCP98244 discontinues transmission (Figure 5-14).

FIGURE 5-14:

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

567

Address Byte

Current Word Address

MCP98244

Master

SDA

SCL

Note:

In this example, the current word address is the

previously accessed address location n plus 1.

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