12C508 datasheet(32/113 Pages) MICROCHIP

32 / 113 page

PIC12C5XX

DS40139E-page 32

FIGURE 7-3:

DATA TRANSFER SEQUENCE ON THE SERIAL BUS

FIGURE 7-4:

ACKNOWLEDGE TIMING

(A)

(B)

(C)

(D)

(A)

(C)

SCL

SDA

START

CONDITION

ADDRESS OR

ACKNOWLEDGE

VALID

DATA

ALLOWED

TO CHANGE

STOP

CONDITION

SCL

Transmitter must release the SDA line at this point

allowing the Receiver to pull the SDA line low to

acknowledge the previous eight bits of data.

Receiver must release the SDA line at this point

so the Transmitter can continue sending data.

Data from transmitter

SDA

Acknowledge

Bit

7.2

Device Addressing

After generating a START condition, the bus master

transmits a control byte consisting of a slave address

and a Read/Write bit that indicates what type of opera-

tion is to be performed. The slave address consists of

a 4-bit device code (1010) followed by three don’t care

bits.

The last bit of the control byte determines the operation

to be performed. When set to a one a read operation is

selected, and when set to a zero a write operation is

selected. (Figure 7-5). The bus is monitored for its cor-

responding slave address all the time. It generates an

acknowledge bit if the slave address was true and it is

not in a programming mode.

FIGURE 7-5:

CONTROL BYTE FORMAT

SACK

R/W

Device Select

Bits

Don’t Care

Bits

Slave Address

Acknowledge Bit

Start Bit

Read/Write Bit

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