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DM560P

V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set

Davicom Semiconductor, Inc. 

DM560P

V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set

DM6583 Functional Description

1. Operating Mode Selection

The DM6583 MCU can be used in both internal and

external modem applications. When operating as an

internal modem, the EXT/INTB input (pin 99) must

be attached to ground. When the DM6583 is

operating as an external modem, the EXT/INTB

input (pin 99) must attached to VDD.

2. Micro-controller Program Memory

The DM6583 supports two bank switch control pins

to switch external program memory among four

banks. The DM6583 can access a total of 256K of

external program memory.

Address mapping:

bank0: 00000H - 0FFFFH

bank1: 10000H - 1FFFFH

bank2: 20000H - 2FFFFH

bank3: 30000H - 3FFFFH

For bank switching, three instructions must be

included in software.

Switch to bank1:

CLR P1.3

SETB P1.7

JMP BANK 1 ADDRESS

Switch to bank2:

CLR P1.7

SETB P1.3

JMP BANK 2 ADDRESS

Switch to bank3:

CLR P1.7

CLR P1.3

JMP BANK 3 ADDRESS

Return to bank 0:

SETB P1.7

SETB P1.3

JMP BANK 0 ADDRESS

* For detailed information about the micro-controller,

refer to the Programmer's Guide to 8032.

Micro-controller Power Down Mode

An instruction that sets the register PD (PCON.1) will

cause the 80C32 to enter power down mode. There

are three ways to wake up the 80C32

(1) Positive pulse signal occurring at the reset pin of

the 80C32

(2) Negative pulse occurring at /RI (P1.0) of the

80C32

(3) Programming the PnP Wake Up Controller

Register.

Enhanced Internal direct Memory

There are two 128 byte banks of internal direct

memory in the 80C32. The system uses the lower

128 bytes under normal conditions. Switching to the

upper bank is achieved by loading register 8FH.1

(SFR of the 80C32) with 1. Switching to the lower

bank can be achieved by loading the same register

with 0.

Reflash Program Memory

By setting 8F.2H the system can switch program and

data memory. If the system uses FLASH memory as

program memory this function is used to reflash

program code by downloading the program to data

memory then switching them.

Example:

SETB 8FH.2

LJMP 0000H

Micro-controller Register Description

UART Clock Register:

Address D4000H Reset State: 06H

Write Only

bit7 bit6 bit5 bit4 bit3 bit2 Bit1 bit0

X dat6 dat5 dat4 dat3 dat2 dat1 0

8

Preliminary

Version: DM560P-DS-P07

August 11, 2000

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