AT83C51SND1C_03 ATMEL [ATMEL Corporation], AT83C51SND1C_03 Datasheet - Page 6

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

Signals
6
AT8xC51SND1C
All the AT8xC51SND1C signals are detailed by functionality in Table 1 to Table 14.
Table 1. Ports Signal Description
Table 2. Clock Signal Description
Signal
Signal
Name
Name
P0.7:0
P1.7:0
P2.7:0
P3.7:0
P4.7:0
P5.3:0
FILT
X1
X2
Type
Type
I/O
I/O
I/O
I/O
I/O
I/O
O
I
I
Description
Port 0
P0 is an 8-bit open-drain bidirectional I/O port. Port 0 pins that have 1s
written to them float and can be used as high impedance inputs. To
avoid any parasitic current consumption, floating P0 inputs must be
polarized to V
Port 1
P1 is an 8-bit bidirectional I/O port with internal pull-ups.
Port 2
P2 is an 8-bit bidirectional I/O port with internal pull-ups.
Port 3
P3 is an 8-bit bidirectional I/O port with internal pull-ups.
Port 4
P4 is an 8-bit bidirectional I/O port with internal pull-ups.
Port 5
P5 is a 4-bit bidirectional I/O port with internal pull-ups.
Description
Input to the on-chip inverting oscillator amplifier
To use the internal oscillator, a crystal/resonator circuit is connected to
this pin. If an external oscillator is used, its output is connected to this
pin. X1 is the clock source for internal timing.
Output of the on-chip inverting oscillator amplifier
To use the internal oscillator, a crystal/resonator circuit is connected to
this pin. If an external oscillator is used, leave X2 unconnected.
PLL Low Pass Filter input
FILT receives the RC network of the PLL low pass filter.
DD
or V
SS
.
4109E–8051–06/03
Alternate
Function
Alternate
Function
KIN3:0
AD7:0
A15:8
MISO
MOSI
SDA
RXD
INT0
INT1
SCK
SCL
TXD
WR
RD
SS
T0
T1
-
-
-
-