ST92F124 datasheet(280/429 Pages) STMICROELECTRONICS

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I2C BUS INTERFACE

I2C BUS INTERFACE (Cont’d)

INTERRUPT VECTOR REGISTER (I2CIVR)

R249 - Read / Write

Reset Value: Undefined

Bits 7:3 = V[7:3] Interrupt Vector Base Address.

User programmable interrupt vector bits. These

are the five more significant bits of the interrupt

vector base address. They must be set before en-

abling the interrupt features.

Bits 2:1 = EV[2:1] Encoded Interrupt Source.

These Read-Only bits are set by hardware accord-

ing to the interrupt source:

– 01: error condition detected

– 10: data received

– 11: peripheral ready to transmit

Bit 0 = Reserved.

Forced by hardware to 0.

RECEIVER DMA SOURCE ADDRESS POINTER

R250 - Read / Write

Reset Value: Undefined

Bits 7:1 = RA[7:1] Receiver DMA Address Pointer.

I2CRDAP contains the address of the pointer (in

the Register File) of the Receiver DMA data

source when the DMA is selected between the

peripheral and the Memory Space. Otherwise,

(DMA between peripheral and Register file), this

See Section 10.8.6.1 for more details on the use

of this register.

Bit 0 = RPS Receiver DMA Memory Pointer Selec-

tor.

If memory has been selected for DMA transfer

(I2CRDC.RF/MEM = 0) then:

0: Select ISR register for Receiver DMA transfer

address extension.

1: Select DMASR register for Receiver DMA trans-

fer address extension.

RECEIVER DMA TRANSACTION COUNTER

R251 - Read / Write

Reset Value: Undefined

Bits 7:1 = RC[7:1] Receiver DMA Counter Pointer.

I2CRDC contains the address of the pointer (in the

counter when the DMA between Peripheral and

Memory Space is selected. Otherwise (DMA be-

tween Peripheral and Register File), this register

points to a pair of registers that are used as DMA

Address register and DMA Transaction 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 Receiver Register File/ Memory

Selector.

0: DMA towards Memory

1: DMA towards Register file

EV2

EV1

RA7 RA6 RA5 RA4 RA3 RA2 RA1

RPS

RC7 RC6 RC5 RC4 RC3 RC2 RC1 RF/MEM

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