VR4102 datasheet(461/701 Pages) NEC

461 / 701 page

461

CHAPTER 24 SIU (SERIAL INTERFACE UNIT)

This chapter describes the SIU’s operations and register settings.

24.1 GENERAL

The SIU is a serial interface that conforms to the RS-232-C communication standard and is equipped with two

one-channel interfaces, one for transmission and one for reception.

This unit is functionally compatible with the NS16550.

24.2 REGISTER SET

The SIU registers are listed below.

Table 24-1. SIU Registers

Address

LCR[7]

R/W

Function

SIURB

Receiver Buffer Register (Read)

SIUTH

Transmitter Holding Register (Write)

0x0C00 0000

R/W

SIUDLL

Divisor Latch (Least Significant Byte)

R/W

SIUIE

Interrupt Enable

0x0C00 0001

R/W

SIUDLM

Divisor Latch (Most Significant Byte)

SIUIID

Interrupt Identification Register (Read)

0x0C00 0002

SIUFC

FIFO Control Register (Write)

0x0C00 0003

R/W

SIULC

Line Control Register

0x0C00 0004

R/W

SIUMC

MODEM Control Register

0x0C00 0005

R/W

SIULS

Line Status Register

0x0C00 0006

R/W

SIUMS

MODEM Status Register

0x0C00 0007

R/W

SIUSC

Scratch Register

0x0C00 0008

R/W

SIUIRSEL

SIU/FIR IrDA Selector

Remark

LCR[7] is the bit 7 of SIULC register.

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