T83C51SND1-ROTIL datasheet(5/60 Pages) ATMEL

5 / 60 page

T8xC51SND1

Rev. D – 15-Nov-01

Table 2. Clock Signal Description

Table 3. Timer 0 and Timer 1 Signal Description

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#

WR#

RD#

P4.7:0

I/O

Port 4

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

MISO

MOSI

SCK

SS#

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.

Signal

Name

Type

Description

Alternate

Function

INT0#

Timer 0 Gate Input

INT0# serves as external run control for timer 0, when selected by

GATE0 bit in TCON register.

External Interrupt 0

INT0# input sets IE0 in the TCON register. If bit IT0 in this register is

set, bit IE0 is set by a falling edge on INT0#. If bit IT0 is cleared, bit IE0

is set by a low level on INT0#.

P3.2

INT1#

Timer 1 Gate Input

INT1# serves as external run control for timer 1, when selected by

GATE1 bit in TCON register.

External Interrupt 1

INT1# input sets IE1 in the TCON register. If bit IT1 in this register is

set, bit IE1 is set by a falling edge on INT1#. If bit IT1 is cleared, bit IE1

is set by a low level on INT1#.

P3.3

Signal

Name

Type

Description

Alternate

Function

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