87C196LA データシートの表示（PDF） - Intel

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87C196LA

CHMOS 16-BIT MICROCONTROLLER

Intel 

87C196LA — AUTOMOTIVE

3.0 SIGNALS

Name

ACH7:2

AD15:0

ADV#

AINC#

Type

I

I/O

O

I

Table 4. Signal Descriptions

Description

Analog Channels

These signals are analog inputs to the A/D converter.

The A/D inputs share package pins with port 0. These pins may individually be

used as analog inputs (ACHx) or digital inputs (P0.y). While it is possible for the

pins to function simultaneously as analog and digital inputs, this is not

recommended because reading port 0 while a conversion is in process can

produce unreliable conversion results.

The ANGND and VREF pins must be connected for the A/D converter and port 0

to function.

ACH7:2 share package pins with the following signals: ACH2/P0.2, ACH3/P0.3,

ACH4/P0.4/PMODE.0, ACH5/P0.5/PMODE.1, ACH6/P0.6/PMODE.2, and

ACH7/P0.7/PMODE.3.

Address/Data Lines

These pins provide a multiplexed address and data bus. During the address

phase of the bus cycle, address bits 0–15 are presented on the bus and can be

latched using ALE or ADV#. During the data phase, 8- or 16-bit data is

transferred.

AD7:0 share package pins with P3.7:0 and PBUS.7:0; AD15:8 share package

pins with P4.7:0 and PBUS.15:8.

Address Valid

This active-low output signal is asserted only during external memory

accesses. ADV# indicates that valid address information is available on the

system address/data bus. The signal remains low while a valid bus cycle is in

progress and is returned high as soon as the bus cycle completes.

An external latch can use this signal to demultiplex the address from the

address/data bus. A decoder can also use this signal to generate chip selects

for external memory.

ADV# shares a package pin with P5.0 and ALE.

Auto Increment

During slave programming, this active-low input enables the auto-increment

feature. (Auto increment allows reading or writing of sequential OTPROM

locations, without requiring address transactions across the programming bus

for each read or write.) AINC# is sampled after each location is programmed or

dumped. If AINC# is asserted, the address is incremented and the next data

word is programmed or dumped.

AINC# shares a package pin with P2.4.

8

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