AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 9

• Manufacturer Part Number: AT83C51SND1C_03
• Description: Single-Chip Flash Microcontroller with MP3 Decoder and Human Interface
• Manufacturer: ATMEL [ATMEL Corporation]

4109E–8051–06/03
Table 10. A/D Converter Signal Description
Table 11. Keypad Interface Signal Description
Table 12. External Access Signal Description
AREFN
Signal
AREFP
Signal
Signal
Name
Name
Name
AIN1:0
KIN3:0
AD7:0
A15:8
ALE
ISP
WR
RD
Type
Type
Type
I/O
I/O
I/O
O
O
O
I
I
I
I
Description
A/D Converter Analog Inputs
Analog Positive Voltage Reference Input
Analog Negative Voltage Reference Input
This pin is internally connected to AVSS.
Description
Keypad Input Lines
Holding one of these pins high or low for 24 oscillator periods triggers a
keypad interrupt.
Description
Address Lines
Upper address lines for the external bus.
Multiplexed higher address and data lines for the IDE interface.
Address/Data Lines
Multiplexed lower address and data lines for the external memory or the
IDE interface.
Address Latch Enable Output
ALE signals the start of an external bus cycle and indicates that valid
address information is available on lines A7:0. An external latch is used
to demultiplex the address from address/data bus.
ISP Enable Input AT89C51SND1C Only
This signal must be held to GND through a pull-down resistor at the
falling reset to force execution of the internal bootloader.
Read Signal
Read signal asserted during external data memory read operation.
Write Signal
Write signal asserted during external data memory write operation.
AT8xC51SND1C
Alternate
Function
Alternate
Function
Alternate
Function
P1.3:0
P2.7:0
P0.7:0
P3.7
P3.6
-
-
-
-
-
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