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DM6582 Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers

Part # DM6582
Description  V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set
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Manufacturer  ETC1 [List of Unclassifed Manufacturers]
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DM560P
V.90 Integrated Data/Fax/Voice/Speakerphone Modem Device Set
8
Preliminary
Version: DM560P-DS-P07
August 11, 2000
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


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