PC87351 datasheet(41/86 Pages) NSC

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2.0 Device Architecture and Configuration (Continued)

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2.8

SERIAL PORT 2 - LOGICAL DEVICE 2

2.8.1

General Description

Serial Port 2 includes IR functionality as described in the Serial Port 2 with IR chapter.

2.8.2

Configuration

2.8.3

Serial Port 2 Configuration Register

This register is reset by hardware to 02h.

Location:

Index F0h

Type:

R/W

Index

Conﬁguration Register or Action

Type

Reset

30h Activate. See also bit 0 of the SIOCF1 Register.

R/W

00h

60h Base Address MSB Register. Bits 7-3 (for A15-11) are read only, 00000b.

R/W

02h

61h Base Address LSB Register. Bit 2-0 (for A2-0) are read only, 000b.

R/W

F8h

70h Interrupt Number

R/W

03h

71h Interrupt Type. Bit 1 is R/W; other bits are read only.

R/W

03h

74h DMA Channel Select 0 (RX_DMA)

R/W

04h

75h DMA Channel Select 1 (TX_DMA)

R/W

04h

F0h Serial Port 2 Conﬁguration Register

R/W

02h

Bit

76543210

Name

Bank

Select

Enable

Reserved

Busy

Indicator

Power

Mode

Control

TRI-STATE

Control

Reset

00000010

Bit

Description

Bank Select Enable. Enables bank switching for Serial Port 2.

0: All attempts to access the extended registers in Serial Port 2 are ignored (default).

1: Enables bank switching for Serial Port 2.

6-3

Reserved

Busy Indicator. This read only bit can be used by power management software to decide when to power-down

the Serial Port 2 logical 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

Serial Port 2 Clock disabled. The output signals are set to their default states. The RI input signal can be

programmed to generate an interrupt. Registers are maintained. (Unlike Active bit in Index 30 that also

prevents access to Serial Port 2 registers.)

1: Normal power mode

Serial Port 2 clock enabled. Serial Port 2 is functional when the logical device is active (default).

TRI-STATE Control. This bit controls the TRI-STATE status of the device output pins when it is inactive

(disabled). One exception is the IRTX pin. It is driven to 0 when Serial Port 2 is inactive, and is not affected by

this bit.

0: Disabled (default)

1: Enabled when device inactive

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