Amd Geode SC2200 Manual do Utilizador descarregar pdf (Página 98)

104 AMD Geode™ SC2200 Processor Data Book

SuperI/O Module

32580B

5.4.2 Logical Device Control and

Configuration

As described in Section 5.3.2 "Banked Logical Device Reg-

isters" on page 98, each functional block is associated with

a Logical Device Number (LDN). This section provides the

The register descriptions in this subsection use the follow-

ing abbreviations for Type:

• R/W = Read/Write

• R = Read from a specific address returns the

value of a specific register. Write to the

same address is to a different register.

•W =Write

• RO = Read Only

• R/W1C = Read/Write 1 to Clear. Writing 1 to a bit

clears it to 0. Writing 0 has no effect.

5.4.2.1 LDN 00h - Real-Time Clock

Table 5-6 lists the registers which are relevant to configura-

tion of the Real-Time Clock (RTC). Only the last registers

(F0h-F3h) are described here (Table 5-7). See Table 5-3

"Standard Configuration Registers" on page 101 for

descriptions of the other registers.

Table 5-6. Relevant RTC Configuration Registers

Index Type Configuration Register or Action

Reset

Value

30h R/W

Activate. When bit 0 is cleared, the registers of this logical device are not accessible.

00h

60h R/W Standard Base Address MSB register. Bits [7:3] (for A[15:11]) are RO, 00000b. 00h

61h R/W Standard Base Address LSB register. Bit 0 (for A0) is RO, 0b. 70h

62h R/W Extended Base Address MSB register. Bits [7:3] (for A[15:11]) are RO, 00000b. 00h

63h R/W Extended Base Address LSB register. Bit 0 (for A0) is RO, 0b. 72h

70h R/W Interrupt Number. 08h

71h R/W Interrupt Type. Bit 1 is R/W; other bits are RO. 00h

74h RO Report no DMA assignment. 04h

75h RO Report no DMA assignment. 04h

F0h R/W RAM Lock register (RLR). 00h

F1h R/W Date of Month Alarm Offset register (DOMAO). Sets index of Date of Month Alarm

00h

F2h R/W Month Alarm Offset register (MONAO). Sets index of Month Alarm register in the

standard base address.

00h

F3h R/W Century Offset register (CENO). Sets index of Century register in the standard base

address.

00h

1. The logical device registers are maintained, and all RTC mechanisms are functional.

1 2 ... 93 94 95 96 97 98 99 100 101 102 103 ... 428 429

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