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L2501

Embedded Modem Family

Conexant Systems 

2.0 Hardware Interface

RC224ATL/224ATLV

EmbeddedModem Family

The parallel interface registers are identified in Table 2-1.

Table 2-1. Parallel Interface Registers (1 of 2)

Register Register

Bit Number

Number Name

7

6

5

4

3

2

1

0

7 Scratch

Register

(SCR)

Scratch Register

6 Modem Data

Ring

Data Set Clear to Delta Data Trailing Delta Data Delta Clear

Status

Carrier Indicator Ready

Send (CTS) Carrier Edge of Set Ready to Send

Register Detect

(RI)

(DSR)

Detect

Ring

(DDSR) (DCTS)

(MSR)

(DCD)

(DDCD) Indicator

(TERI)

5 Line Status

Register

(LSR)

0

Transmitter Transmitter Break

Framing Parity Error Overrun Data Ready

Empty

Holding Interrupt Error (FE) (PE)

Error (OE) (DR)

(TEMT) Register (BI)

(THRE)

4 Modem

0

0

0

Local

Out 2

Out 1 Request to Data

Control

Loopback

Send (RTS) Terminal

Register

Ready

(MCR)

(DTR)

3 Line

Divisor Set Break Stick Parity Even Parity Parity

Number of Word

Word

Control Latch

(SB)

(SP)

Select

Enable

Stop Bits Length Length

Register Access Bit

(EPS)

(PEN)

(STB)

Select Bit 1 Select Bit 0

(LCR)

(DLAB)

(WLS1) (WLS0)

2 Interrupt

0

0

0

0

0

Pending Pending 0 if

Identify

Interrupt ID Interrupt ID Interrupt

Register

Bit 1

Bit 0

Pending

(IIR) (Read

(PL1)

(PL0)

(IP)

Only)

1 Interrupt

0

0

0

0

Enable

Enable

Enable

Enable

DLAB = 0 Enable

Modem Receiver Transmitter Received

Register

Status

Line Status Holding Data

(IER)

Interrupt Interrupt Register Available

(EDSSI) (ELSI)

Empty

Interrupt

Interrupt (ERBFI)

(ETBEI)

0

DLAB = 0

Transmitter

Holding

Register

(THR)

Transmitter Holding Register (Write Only)

0

DLAB = 0

Receiver

Buffer

Register

(RBR)

Receiver Buffer Register (Read Only)

2-4

Conexant

D224ATLVDSC

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