AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 25
AT83C51SND1C_03
Manufacturer Part Number
AT83C51SND1C_03
Description
Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT83C51SND1C_03.pdf
(210 pages)
- Current page: 25 of 210
- Download datasheet (2Mb)
External Space
Memory Interface
Page Access Mode
4109E–8051–06/03
The external memory interface comprises the external bus (port 0 and port 2) as well as
the bus control signals (RD, WR, and ALE).
Figure 17 shows the structure of the external address bus. P0 carries address A7:0
while P2 carries address A15:8. Data D7:0 is multiplexed with A7:0 on P0. Table 27
describes the external memory interface signals.
Figure 17. External Data Memory Interface Structure
Table 27. External Data Memory Interface Signals
The AT8xC51SND1C implement a feature called Page Access that disables the output
of DPH on P2 when executing MOVX @DPTR instruction. Page Access is enable by
setting the DPHDIS bit in AUXR register.
Page Access is useful when application uses both ERAM and 256 Bytes of XRAM. In
this case, software modifies intensively EXTRAM bit to select access to ERAM or XRAM
and must save it if used in interrupt service routine. Page Access allows external access
above 00FFh address without generating DPH on P2. Thus ERAM is accessed using
MOVX @Ri or MOVX @DPTR with DPTR < 0100h, and XRAM is accessed using
MOVX @DPTR with DPTR ≥ 0100h while keeping P2 for general I/O usage.
Signal
Name
AD7:0
A15:8
ALE
WR
RD
Type
I/O
O
O
O
O
AT8xC51SND1C
Description
Address Lines
Upper address lines for the external bus.
Address/Data Lines
Multiplexed lower address lines and data for the external memory.
Address Latch Enable
ALE signals indicates that valid address information are available on lines
AD7:0.
Read
Read signal output to external data memory.
Write
Write signal output to external memory.
ALE
WR
RD
P2
P0
AD7:0
A15:8
Latch
A7:0
A15:8
A7:0
D7:0
OE
WR
PERIPHERAL
AT8xC51SND1C
RAM
Alternate
Function
P2.7:0
P0.7:0
P3.7
P3.6
-
25
Related parts for AT83C51SND1C_03
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
Atmel CryptoMemory, 16Kbit
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontrollers
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 16/32/64/128K Bytes In-System Programmable Flash
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
8-bit Atmel Microcontroller with 16/32/64K Bytes In-System Programmable Programmable
Manufacturer:
ATMEL [ATMEL Corporation]
Datasheet:
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Monolithic Integrated Feature Phone Circuit
Manufacturer:
ATMEL Corporation
Datasheet:
Part Number:
Description:
Multistandard Video-IF and Quasi Parallel Sound Processing
Manufacturer:
ATMEL Corporation
Datasheet: