MCP7940MIP datasheet(17/38 Pages) MICROCHIP

17 / 38 page

 2012 Microchip Technology Inc.

Preliminary

DS22292A-page 17

MCP7940M

5.2.2.3

Sequential Read

Sequential reads are initiated in the same way as a

random read except that after the MCP7940M

transmits the first data byte, the master issues an

Acknowledge as opposed to the Stop condition used in

a random read. This Acknowledge directs the

MCP7940M

transmit

the

sequentially

addressed 8-bit word (Figure 5-6). Following the final

byte transmitted to the master, the master will NOT

generate an Acknowledge but will generate a Stop

condition. To provide sequential reads, the MCP7940M

contains an internal Address Pointer which is

incremented by one at the completion of each

operation. This Address Pointer allows the entire

memory contents to be serially read during one

operation. The internal Address Pointer will automat-

ically roll over to the start of the Block.

FIGURE 5-5:

RANDOM READ

FIGURE 5-6:

SEQUENTIAL READ

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

CONTROL

BYTE

ADDRESS

BYTE

CONTROL

BYTE

DATA

BYTE

S 1 101

111

S 10 10

BUS ACTIVITY

MASTER

SDA LINE

BUS ACTIVITY

CONTROL

BYTE

DATA n

DATA n + 1

DATA n + 2

DATA n + X

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