CD1865 datasheet(93/150 Pages) INTEL

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Intelligent Eight-Channel Communications Controller — CD1865

Datasheet

}

case 128:

// case of DSR change interrupt

{

printf(" DSR has a changed state.\n");

break;

}

default:

{

printf(" Invalid Modem interrupt detected.......\n");

break;

}

Set_Byte(MCR, 0x00);

// Clear the Modem Change register after

// service the modem request.

Set_Byte(EOSRR, 0x00);

// Clear the EOSRR register at the end

// modem service routine.

return;

}

8.11.5

Polled Mode Operation

The Polled-mode operation can be used with any type of host CPU, or it can be used in

combination with interrupts to provide a Mixed-mode system optimized for a particular operation.

For details refer to Section 5.5 on page 35.

In the Polled-mode operation, the Service Match registers need to be setup first (TSMR, RSMR,

MSMR) in the channel initialization routine. Once an interrupt is detected, it is acknowledged by

reading the corresponding register depending on the type of interrupt.

while ( !((int_status = Read_Byte( SRSR )) & 0x15 ) )

{

// waiting for interrupt.

break;

}

// Case of Receiving interrupt

if ( int_status & 0x10 )

{

Read_Byte(RSMR)

Service_Rx();

}

// Case of transmitting interrupt

if ( int_status & 0x04 )

{

Read_Byte(TSMR)

Service_Tx();

}

// case of modem interrupt

if (int_status & 0x02)

{

Read_Byte(MSMR)

Service_Mdm();

}

CD1865 Datasheet(PDF) 93 Page - Intel Corporation

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