AT89C5132-ROTIL datasheet(8/38 Pages) ATMEL

8 / 38 page

AT89C5132

4173CS–USB–07/04

Table 11. A/D Converter Signal Description

Table 12. Keypad Interface Signal Description

Table 13. External Access Signal Description

Signal

Name

Type

Description

Alternate

Function

AIN1:0

A/D Converter Analog Inputs

AREFP

Analog Positive Voltage Reference Input

AREFN

Analog Negative Voltage Reference Input

This pin is internally connected to AVSS.

Signal

Name

Type

Description

Alternate

Function

KIN3:0

Keypad Input Lines

Holding one of these pins high or low for 24 oscillator periods triggers a

keypad interrupt.

P1.3:0

Signal

Name

Type

Description

Alternate

Function

A15:8

I/O

Address Lines

Upper address lines for the external bus.

Multiplexed higher address and data lines for the IDE interface.

P2.7:0

AD7:0

I/O

Address/Data Lines

Multiplexed lower address and data lines for the external memory or the

IDE interface.

P0.7:0

ALE

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

I/O

ISP Enable Input

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.

P3.7

Write Signal

Write signal asserted during external data memory write operation.

P3.6

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