DM6210 datasheet(51/91 Pages) ETC

51 / 91 page

6-3

Software Selectable Interrupt Sources

The interrupt circuit on the DM6210 has 7 software selectable interrupt sources which can be pro-

grammed in bits 0 through 2 of the Interrupt Register at BA + 5, as described and shown below.

This register is used to set the interrupt source and channel. Reading this register returns the current

settings.

End-of-Convert - an interrupt is generated when the A/D conversion is done.

User TC Counter 0 out - an interrupt is generated when user TC Counter 0's count reaches 0.

User TC Counter 1 out - an interrupt is generated when user TC Counter 1's count reaches 0.

User TC Counter 2 out - an interrupt is generated when user TC Counter 2's count reaches 0.

External Clock 2 - an interrupt is generated when the external clock 2 (CN3 - 45) line is pulsed.

P0 Latch Status - an interrupt is generated when data has been latched into Port 0.

P1 Latch Status - an interrupt is generated when data has been latched into Port 1.

Software Selectable Interrupt Channel

There are 7 software selectable interrupt channels which can be programmed in bits 3 through 5 of the

Interrupt Register at BA + 5. The interrupt output is driven by an open collector device which is turned off

when the IRQ channel is set to disable. At power up or reset, this register is set to all zero's.

IRQ Source Select

000 = End-of-Convert

001 = User TC Counter 0 out

010 = User TC Counter 1 out

011 = User TC Counter 2 out

100 = External Clock 2

101 = P0 Latch Status

110 = P1 Latch Status

111 = Reserved

IRQ Channel Select

000 = Disabled

001 = IRQ3

010 = IRQ5

011 = IRQ9

100 = IRQ10

101 = IRQ11

110 = IRQ12

111 = IRQ15

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