SC2200 datasheet(140/433 Pages) NSC

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Revision 3.0

SuperI/O Module (Continued)

4.8.2

UART Functionality (SP1 and SP2)

Both SP1 and SP2 provide UART functionality. The generic

SP1 and SP2 support serial data communication with

remote peripheral device or modem using a wired inter-

face. The functional blocks can function as a standard

16450, 16550, or as an Extended UART.

4.8.2.1

UART Mode Register Bank Overview

Four register banks, each containing eight registers, control

UART operation. All registers use the same 8-byte address

space to indicate offsets 00h through 07h. The BSR regis-

ter selects the active bank and is common to all banks. See

Figure 4-18.

4.8.2.2

SP1 and SP2 Register and Bit Maps for UART

Functionality

The tables in this subsection provide register and bit maps

for Banks 0 through 3.

Figure 4-18. UART Mode Register Bank

Architecture

Bank 0

Bank 1

Bank 2

Bank 3

Offset 07h

Offset 06h

Offset 05h

Offset 04h

LCR/BSR

Offset 02h

Offset 01h

Offset 00h

Common

Throughout

All Banks

16550 Banks

Table 4-37. Bank 0 Register Map

Offset

Type

Name

00h

RXD. Receiver Data Port

TXD. Transmitter Data Port

01h

R/W

IER. Interrupt Enable

02h

EIR. Event Identification (Read Cycles)

R/W

FCR. FIFO Control (Write Cycles)

03h

LCR1. Line Control

R/W

BSR1.Bank Select

04h

R/W

MCR. Modem/Mode Control

05h

R/W

LSR. Link Status

06h

R/W

MSR. Modem Status

07h

R/W

SPR. Scratchpad

R/W

ASCR. Auxiliary Status and Control

When bit 7 of this register is set to 1, bits [6:0] of BSR select the bank, as shown in Table 4-38.

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