UPSD3422EB40U6 datasheet(127/300 Pages) STMICROELECTRONICS

127 / 300 page

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Product(s)

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Product(s)

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Product(s)

UPSD3422, UPSD3433, UPSD3434, UPSD3454

I2C interface

127/300

23.6

General call address

A General Call (GC) occurs when a Master-Transmitter initiates a transfer containing a

Slave address of 0000000b, and the R/W bit is logic 0. All Slave devices capable of

responding to this broadcast message will acknowledge the GC simultaneously and then

behave as a Slave-Receiver. The next byte transmitted by the Master will be accepted and

acknowledged by all Slaves capable of handling the special data bytes. A Slave that cannot

handle one of these data bytes must ignore it by not acknowledging it. The I2C specification

lists the possible meanings of the special bytes that follow the first GC address byte, and the

actions to be taken by the Slave device(s) upon receiving them. A common use of the GC by

a Master is to dynamically assign device addresses to Slave devices on the bus capable of a

programmable device address.

The UPSD34xx can generate a GC as a Master-Transmitter, and it can receive a GC as a

Slave. When receiving a GC address (00h), an interrupt will be generated so firmware may

respond to the special GC data bytes if desired.

23.7

Serial I/O engine (SIOE)

At the heart of the I2C interface is the hardware SIOE, shown in Figure 42. The SIOE

automatically handles low-level I2C bus protocol (data shifting, handshaking, arbitration,

clock generation and synchronization) and it is controlled and monitored by five SFRs.

The five SFRs shown in Figure 42 are:

●

S1CON - Interface control (Table 75 on page 129)

●

S1STA - Interface status (Table 78 on page 130)

●

S1DAT - Data shift register (Table 80 on page 132)

●

S1ADR - Device address (Table 82 on page 132)

●

S1SETUP - Sampling rate (Table 84 on page 133)

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Product(s)

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Product(s)

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