SC2200 datasheet(110/433 Pages) NSC

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110

Revision 3.0

SuperI/O Module (Continued)

4.4.2.3

LDN 02h - Infrared Communication Port or

Serial Port 3

Table 4-9 lists the configuration registers which affect the

Infrared Communication Port or Serial Port 3 (IRCP/SP3).

Only the last register (F0h) is described here (Table 4-10).

See Table 4-3 "Standard Configuration Registers" on page

104 for descriptions of the other registers listed.

Table 4-9. Relevant IRCP/SP3 Registers

Index

Type

Configuration Register or Action

Reset

Value

30h

R/W

Activate. See also bit 0 of the SIOCF1 register.

00h

60h

R/W

Base Address MSB register. Bits [7:3] (for A[15:11]) are RO, 00000b.

03h

61h

R/W

Base Address LSB register. Bit [2:0] (for A[2:0]) are RO, 000b.

E8h

70h

R/W

Interrupt Number.

00h

71h

R/W

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

03h

74h

R/W

DMA Channel Select 0 (RX_DMA).

04h

75h

R/W

DMA Channel Select 1 (TX_DMA).

04h

F0h

R/W

Infrared Communication Port/Serial Port 3 Configuration register.

02h

Table 4-10.

IRCP/SP3 Configuration Register

Bit

Description

Index F0h

Infrared Communication Port/Serial Port 3 Configuration Register (R/W)

Reset Value: 02h

Bank Select Enable. Enables bank switching.

0: All attempts to access the extended registers are ignored. (Default)

1: Enables bank switching.

6:3

Reserved.

Busy Indicator. (RO) This bit can be used by power management software to decide when to power-down the device.

0: No transfer in progress. (Default)

1: Transfer in progress.

Power Mode Control. When the logical device is active in:

0: Low power mode - Clock disabled. The output signals are set to their default states. Registers are maintained. (Unlike

Active bit in Index 30h that also prevents access to device registers.)

1: Normal power mode - Clock enabled. The device is functional when the logical device is active. (Default)

TRI-STATE Control. When enabled and the device is inactive, the logical device output pins are in TRI-STATE. One excep-

tion is the IRTX/SOUT3 pin, which is driven to 0 when the Infrared Communication Port or Serial Port 3 is inactive and is not

affected by this bit.

0: Disabled. (Default)

1: Enabled (when the device is inactive).

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