PC87307 datasheet(29/218 Pages) NSC

29 / 218 page

Configuration

www.national.com

TABLE 2-8. PnP Interrupt Conﬁguration Registers

TABLE 2-9. PnP DMA Conﬁguration Registers

TABLE 2-10. PnP Logical Device Conﬁguration Registers

Index

Name

Deﬁnition

70h

Interrupt Request

Level Select 0

Read/write value indicating selected interrupt level.

Bits3-0 select the interrupt level used for interrupt 0. A value of 1 selects IRQL 1, a value

of 15 selects IRQL 15. IRQL 0 is not a valid interrupt selection and (represents no

interrupt selection.

71h

Interrupt Request

Type Select 0

Read/write value that indicates the type and level of the interrupt request level selected in

the previous register.

If a card supports only one type of interrupt, this register may be read-only.

Bit 0 - Type of the interrupt request selected in the previous register.

0 - Edge

1 - Level

Bit1 - Level of the interrupt request selected in the previous register. (see also “IRQ

Mapping” on page 181).

0 - Low polarity (implies open-drain output with strong pull-up for a short time, followed

by weak pull-up).

1 - High polarity (implies push-pull output).

Index

Name

Deﬁnition

74h

DMA Channel

Select 0

Read/write value indicating selected DMA channel for DMA 0.

Bits 2-0 select the DMA channel for DMA 0. A value of 0 selects DMA channel 0; a

value of 7 selects DMA channel 7.

Selecting DMA channel 4, the cascade channel, indicates that no DMA channel is

active.

75h

DMA Channel

Select 1

Read/write value indicating selected DMA channel for DMA 1

Bits 2-0 select the DMA channel for DMA 1. A value of 0 selects DMA channel 0; a

value of 7 selects DMA channel 7.

Selecting DMA channel 4, the cascade channel, indicates that no DMA channel is

active.

Index

Name

Deﬁnition

F0h-FEh

Logical Device

Conﬁguration

Vendor Deﬁned

Vendor deﬁned.

PC87307 Folha de dados(PDF) 29 Page - National Semiconductor (TI)

PC87307 Folha de dados(HTML) 29 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Folha de dados Download

Ligação URL