SN250 datasheet(52/130 Pages) STMICROELECTRONICS

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Functional description—application modules

SN250

52/130

Full I2C frames have to be constructed under software control by generating individual I2C

segments. All necessary segment transitions are shown in Figure 7. ACK or NACK

generation of an I2C receive frame segment is determined with the register bit SC_I2CACK

in the SC1_I2CCTRL2 register.

Figure 7.

I2C segment transitions

Generation of a 7-bit address is accomplished with one transmit segment. The upper 7 bits

of the transmitted character contain the 7-bit address. The remaining lower bit contains the

command type (“read” or “write”).

Generation of a 10-bit address is accomplished with two transmit segments. The upper 5

bits of the first transmit character must be set to 0x1E. The next 2 bits are for the 2 most

significant bits of the 10-bit address. The remaining lower bit contains the command type

----

SC1-4M

mode

Illegal

----

SC1-4A

mode

Illegal

Table 23.

SC1 I2C master frame segments (continued)

SC1_I2CCTRL1

Frame Segments

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