ST92F124 datasheet(281/429 Pages) STMICROELECTRONICS

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I2C BUS INTERFACE

I2C BUS INTERFACE (Cont’d)

TRANSMITTER

DMA

SOURCE

ADDRESS

POINTER REGISTER (I2CTDAP)

R252 - Read / Write

Reset Value: Undefined

Bits 7:1= TA[7:1] Transmit DMA Address Pointer.

I2CTDAP contains the address of the pointer (in

the Register File) of the Transmitter DMA data

source when the DMA between the peripheral and

the Memory Space is selected. Otherwise (DMA

between the peripheral and Register file), this reg-

ister has no meaning.

See Section 10.8.6.2 for more details on the use

of this register.

Bit 0 = TPS Transmitter DMA Memory Pointer Se-

lector.

If memory has been selected for DMA transfer

(I2CTDC.RF/MEM = 0) then:

0: Select ISR register for transmitter DMA transfer

address extension.

1: Select DMASR register for transmitter DMA

transfer address extension.

TRANSMITTER DMA TRANSACTION COUN-

TER REGISTER (I2CTDC)

R253 - Read / Write

Reset Value: Undefined

Bits 7:1 = TC[7:1] Transmit DMA Counter Pointer.

I2CTDC contains the address of the pointer (in the

counter when the DMA between Peripheral and

Memory Space is selected. Otherwise, if the DMA

between Peripheral and Register File is selected,

this register points to a pair of registers that are

used as DMA Address register and DMA Transac-

tion Counter.

See Section 10.8.6.1 and Section 10.8.6.2

for

more details on the use of this register.

Bit 0 = RF/MEM Transmitter Register File/ Memo-

ry Selector.

0: DMA from Memory

1: DMA from Register file

EXTENDED CLOCK CONTROL REGISTER

(I2CECCR)

R254 - Read / Write

Reset Value: 0000 0000 (00h)

Bits 7:2 = Reserved. Must always be cleared.

Bits 1:0 = CC[8:7] 9-bit divider programming

Implementation of a programmable clock divider.

These bits and the CC[6:0] bits of the I2CCCR reg-

ister select the speed of the bus (FSCL).

For a description of the use of these bits, see the

I2CCCR register.

They are not cleared when the interface is disa-

bled (I2CCCR.PE=0).

TA7

TA6

TA5

TA4

TA3

TA2

TA1

TPS

TC7

TC6

TC5

TC4

TC3

TC2

TC1 RF/MEM

CC8 CC7

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