AT80C51SND1C-ROTIL Atmel, AT80C51SND1C-ROTIL Datasheet - Page 19

• Manufacturer Part Number: AT80C51SND1C-ROTIL
• Description: IC MCU FLASH MP3 DECODER 80-TQFP
• Manufacturer: Atmel
• Series: 80Cr

Specifications of AT80C51SND1C-ROTIL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, IDE/ATAPI, MMC, SPI, UART/USART, USB
• Peripherals: Audio, I²S, MP3, PCM, POR, WDT
• Number Of I /o: 44
• Program Memory Type: ROMless
• Ram Size: 2.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.3 V
• Data Converters: A/D 2x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 80-TQFP, 80-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Other names: AT80C51SND1CROTIL

6.1.1
6.1.2
4109L–8051–02/08
User Space
Memory Interface
Figure 6-2.
This space is composed of a 64K Bytes code (Flash, EEPROM, EPROM…) memory. It contains
the user’s application code.
The external memory interface comprises the external bus (port 0 and port 2) as well as the bus
control signals (PSEN, and ALE).
Figure 6-3 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 6-3 describes the exter-
nal memory interface signals.
Figure 6-3.
Table 20. External Code Memory Interface Signals
Signal
Name
AD7:0
PSEN
A15:8
ALE
AT80C51SND1C Memory Architecture
External Code Memory Interface Structure
Type
I/O
O
O
O
AT80C51SND1C
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.
Program Store Enable Output (AT80C51SND1C Only)
This signal is active low during external code fetch or external code read
(MOVC instruction).
PSEN
ALE
FFFFh
P2
P0
0000h
AD7:0
External Memory
64K Bytes
A15:8
Latch
A7:0
User
A15:8
A7:0
D7:0
OE
EPROM
AT8xC51SND1C
Flash
Alternate
Function
P2.7:0
P0.7:0
-
-
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