參數資料
型號: CD1284
廠商: Intel Corp.
英文描述: IEEE 1284-Compatible Parallel Interface Controller with Two High-Speed Asynchronous Serial Ports
中文描述: 符合IEEE 1284兼容并行接口控制器兩個高速異步串行端口
文件頁數: 99/176頁
文件大?。?/td> 2255K
代理商: CD1284
IEEE 1284-Compatible Parallel Interface Controller
CD1284
Datasheet
99
6.4.3
Modem Service
/* The following routine services the modem change service request. Context switch
is set up by activating the SVCACKM* input, reading the MIVR. The routine reads the
MISR register to determine which modem signal(s) changed. Channel status is an
externally defined variable that this routine updates. */
service_mdm( )
{
char
vector, channel;
vector = inportb(SVCACKM);
value */
channel = inportb(MICR) >> 2;
mdm_status[channel] = inportb(MISR);/* get status of which modem signals
changed */
outportb(EOSRR, 0x00);
*/
}
/* retrieve and save transmit interrupt
/* extract channel number from the RICR*/
/* write dummy value to EOSRR to terminate
6.5
Parallel Channel Service Routines
In most respects, the parallel channel functions in the same way as the two serial channels, but the
Poll mode operation is different. Its functions can be performed in a couple of ways. The MPU is
only involved with the parallel channel in performing interrupt generation services. All other
channel operations are completely separate. Since the MPU is involved in the interrupt structure,
aspects of its behavior must be taken into account.
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