ST9 datasheet(97/146 Pages) STMICROELECTRONICS

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ST9 USER GUIDE

4.6.1.2.3 Interrupt Vectors

The interrupt vector scheme has been explained in Section 3.4.1 using the example of the

MFT to illustrate the mechanism. Here is the equivalent table for the SCI giving the position of

the four vectors dedicated to the four interrupt causes.

4.6.2 SCI Application 1: Sending Bytes using Interrupts

This application sends 10 bytes to the USART. An interrupt is generated at the end of every

single byte transmission. During this interrupt routine, the TXBR register is loaded with the

next byte to be transmitted. This application is found in the SCI/appli directory.

The character format is: 2400 bauds, 8 data bits, 1 stop bit and odd parity. Sent bytes can be

received on a PC loaded with a serial communication management software program such as

Hyperteminal.

4.6.3 SCI Application 2: Sending Bytes using DMA

This application sends bytes from the memory to the SCI peripheral using a DMA channel.

The transfer is re-initialized twice in the DMA End of Block interrupt routine so that data is

transmitted three times. This application is found in the SCI/appli2 directory.

4.6.4 SCI Application 3: Sending and Receiving Bytes using DMA

This application sends bytes from the memory to SCI and receives bytes from SCI to the reg-

ister file using two DMA channels. The SCI cell is configured in loopback so that each byte

sent is immediately received by the SCI. This application is found in the SCI/appli3 directory.

4.6.5 SCI Application 4: Matching Input Bytes

This application receives bytes from the USART and reacts only if an “F” (upper case) is re-

ceived: on a character match, a “0” is displayed on the 7-segment LED display on port 4. This

application is found in the SCI/appli4 directory.

Value in IVR

Interrupt cause

Address in ROM of the

selected pointer

Value of the Pointer to interrupt

routine

Receiver error

Address of error processing routine

Break detect or address match

50+2

Address of Address match process-

ing routine

Receiver data ready or DMA end of

block

50+4

Address of receive DMA end of block

processing routine

Transmitter buffer empty of DMA end

of block

50+6

Address of transmit DMA end of block

processing routine

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