DM336P datasheet(13/40 Pages) ETC

13 / 40 page

DM336P

V.34 Integrated Data/ Fax/Voice/Speakerphone Modem Device Set

Final

Version: DM336P-DS-F02

August 15, 2000

h. Modem Status Register (MSR): Address 6

Reset State bit 0-3 : low , bit 4-7: Input Signal

bit7 bit6 bit5 bit4

bit3

bit2

bit1

bit0

DCD

DSR CTS DDCD TERI DDSR DCTS

This 8-bit register provides the current state of the

control lines from the Modem to the CPU. In addition,

four bits of the Modem Status Register provide

change information. These bits are set to a logic 1

whenever a control input from the Modem changes

state. They are reset to logic 0 whenever the CPU

reads the Modem Status Register.

Bit 0: This bit is the Delta Clear to Send (DCTS)

indicator. Bit 0 indicates that the CTS (MSCR3)

has changed state since the last time it was

read by the CPU.

Bit 1: This bit is the Delta Data Set Ready (DDSR)

indicator. Bit 1 indicates that the DSR (MSCR2)

has changed state since the last time it was

read by the CPU.

Bit 2: This bit is the Trailing Edge of Ring indicator. Bit

2 indicates that the RI (MSCR0) has changed

from a low to a high state.

Bit 3: This bit is the Delta Data Carrier Detect (DDCD)

indicator. Bit 3 indicates that the DCD (MSCR1)

has changed state.

Note: Whenever bit 0, 1, 2 or 3 is set to a logic 1, a

Modem Status Interrupt is generated.

Bit 4: This bit reflects the value of MSCR3

(CTS).

Bit 5: This bit reflects the value of MSCR2

(DSR).

Bit 6: This bit reflects the value of MSCR0 (RI).

Bit 7: This bit reflects the value of MSCR1

(DCD).

i. Scratch Register (SCR): Address 7

Reset State 00h

This 8-bit Read/Write Register does not control the

UART in any way. It is intended as a Scratch Pad

temporarily.

j. Divisor Latch (DLL): Address 0 (DLAB = 1)

Reset State 00h

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

DAT7 DAT6 DAT5 DAT4 DAT3 DAT2 DAT1 DAT0

This register contains baud rate information from the

host PC. The PC sets the Divisor Latch Register

values.

k. Divisor Latch (DLM): Address 1 (DLAB = 1)

Reset State 00h

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

DAT7 DAT6 DAT5 DAT4 DAT3 DAT2 DAT1 DAT0

This register contains baud rate information from the

host PC.

Note: Two 8-bit latches (DLL-DLM) store the divisor in

16-digit binary format. The desired baud rate

can be obtained by dividing the 115200Hz clock

by the divisor.

Desired Baud Rate

Divisor Value

2304

1536

110

1047

150

768

300

384

600

192

1200

2400

4800

9600

19200

38400

57600

115200

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