STMPE821 datasheet(12/55 Pages) STMICROELECTRONICS

12 / 55 page

I2C interface

STMPE821

12/55

Table 4.

Operation modes

Figure 8.

Read and write modes (random and sequential)

Mode

Byte

Programming sequence

Read

≥1

Start, Device address, R/W = 0, Register address to be read

Restart, Device address, R/W = 1, Data Read, STOP

If no Stop is issued, the Data Read can be continuously performed. If

the register address falls within the range that allows an address auto-

increment, then the register address auto-increments internally after

every byte of data being read. For those register addresses that fall

within a non-incremental address range, the address will be kept static

throughout the entire write operations. Refer to the memory map table

for the address ranges that are auto and non-increment. An example

of such a non-increment address is FIFO

Write

≥1

Start, Device address, R/W = 0, Register address to be written, Data

Write, Stop

If no Stop is issued, the Data Write can be continuously performed. If

the register address falls within the range that allows address auto-

increment, then the register address auto-increments internally after

every byte of data being written in. For those register addresses that

fall within a non-incremental address range, the address will be kept

static throughout the entire write operations. Refer to the memory map

table for the address ranges that are auto and non-increment. An

example of a non-increment address is Data port for initializing the

PWM commands.

Device

Address

Reg

Address

Device

Address

Data

Read

One byte

Read

Device

Address

Reg

Address

Device

Address

Data

Read

More than one byte

Read

Data

Read + 1

Data

Read + 2

Device

Address

Reg

Address

Data

to be

written

One byte

Write

More than one byte

Read

Device

Address

Reg

Address

Data to

Write

Data to

Write + 2

Data to

Write + 1

Master

Slave

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