DM562AP datasheet(14/48 Pages) DAVICOM

14 / 48 page

DM562AP

V.90 Integrated Data/ Fax/Voice/Speakerphone

Modem Device Single Chip with Memory Built in

Final

DM6588A Functional Description

1. Operating Mode Selection

The DM6588A can be used in internal or external

modem applications. When operating as an internal

modem, the EXT/INTB input (pin 122) must be

attached to ground, and vice versa (VDD) when

operating as an external modem.

External mode is operated with host by UART.

Internal mode can support parallel (ISA) and PCI

interface to host. The TEST4 input (Pin 1) is for ISA

or PCI selection.

2. Micro-controller Program Memory

The DM6588A supports two bank switch control pins

to switch external program memory among four

banks. The DM6588A 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.

3. 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

4. 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.

5. Re-flash Program Memory

By setting 8FH.2 the system can switch program and

data memory. If the system uses FLASH memory as

program memory this function is used to re-flash

program code by downloading the program to data

memory then switching them.

Example:

SETB

8FH.2

LJMP

0000H

6. Micro-controller I/O Description

MODEM expansion port: Address C800H (external

only)

Bit7

Bit6

bit5

bit4

bit3

bit2

bit1

bit0

OUT

INP3 INP2 INP1 INP0

Bit0 to Bit3: read only

Bit4 to Bit7: write only

Modem Output Port 1 Register: Address D000H

Write only

Bit7

bit6

bit5

bit4 Bit3

bit2

bit1

bit0

/Voice Voice

-sel2

Voice

-Sel1

/POR

Version: DM562AP-DS-F03

Nov. 09, 2007

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