AT89C51SND1C-ROTIL datasheet(6/210 Pages) ATMEL

6 / 210 page

AT8xC51SND1C

4109E–8051–06/03

Signals

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

Name

Type

Description

Alternate

Function

P0.7:0

I/O

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 VDD or VSS.

AD7:0

P1.7:0

I/O

Port 1

P1 is an 8-bit bidirectional I/O port with internal pull-ups.

KIN3:0

SCL

SDA

P2.7:0

I/O

Port 2

P2 is an 8-bit bidirectional I/O port with internal pull-ups.

A15:8

P3.7:0

I/O

Port 3

P3 is an 8-bit bidirectional I/O port with internal pull-ups.

RXD

TXD

INT0

INT1

P4.7:0

I/O

Port 4

P4 is an 8-bit bidirectional I/O port with internal pull-ups.

MISO

MOSI

SCK

P5.3:0

I/O

Port 5

P5 is a 4-bit bidirectional I/O port with internal pull-ups.

Signal

Name

Type

Description

Alternate

Function

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.

FILT

PLL Low Pass Filter input

FILT receives the RC network of the PLL low pass filter.

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