SIGNAL DESCRIPTIONS

 

 

Table A-3. Signal Descriptions (Continued)

Name

Type

Description

 

 

 

P0.7:0

I

Port 0

 

 

This is a high-impedance, input-only port. Port 0 pins should not be left floating.

 

 

These pins may individually be used as analog inputs (ACHx) or digital inputs

 

 

(P0.x). 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.

 

 

ANGND and VREF must be connected for port 0 to function.

 

 

P0.7:4 are multiplexed with ACH7:4 and PMODE.3:0. P0.3:0 are multiplexed

 

 

with ACH3:0.

P1.7:0

I/O

Port 1

 

 

This is a standard, bidirectional port that is multiplexed with individually

 

 

selectable special-function signals.

 

 

Port 1 is multiplexed as follows: P1.0/EPA0, P1.1/EPA1, P1.2/EPA2,

 

 

P1.3/EPA3, P1.4/T1CLK, P1.5/T1DIR, P1.6/T2CLK, and P1.7/T2DIR.

P2.7:0

I/O

Port 2

 

 

This is a standard bidirectional port that is multiplexed with individually

 

 

selectable special-function signals.

 

 

P2.6 is multiplexed with the ONCE# function. If this pin is held low during reset,

 

 

the device will enter ONCE mode, so exercise caution if you use this pin for

 

 

input. If you choose to configure this pin as an input, always hold it high during

 

 

reset and ensure that your system meets the VIH specification (see datasheet)

 

 

to prevent inadvertent entry into a test mode.

 

 

Port 2 is multiplexed as follows: P2.0/TXD/PVER, P2.1/RXD/PALE#,

 

 

P2.2/EXTINT/PROG#, P2.3/BREQ#, P2.4/INTOUT#/AINC#, P2.5/HOLD#,

 

 

P2.6/HLDA#/ONCE#/CPVER, P2.7/CLKOUT/PACT#.

P3.7:0

I/O

Port 3

 

 

This is an 8-bit, bidirectional, memory-mapped I/O port with open-drain outputs.

 

 

The pins are shared with the multiplexed address/data bus, which has comple-

 

 

mentary drivers.

 

 

P3.7:0 are multiplexed with AD7:0, SLP7:0, and PBUS.7:0.

P4.7:0

I/O

Port 4

 

 

This is an 8-bit, bidirectional, memory-mapped I/O port with open-drain outputs.

 

 

The pins are shared with the multiplexed address/data bus, which has comple-

 

 

mentary drivers.

 

 

P4.7:0 are multiplexed with AD15:8 and PBUS15:8.

P5.7:0

I/O

Port 5

 

 

This is an 8-bit, bidirectional, memory-mapped I/O port.

 

 

P5.4 is multiplexed with a special test-mode-entry function. If this pin is held low

 

 

during reset, the device will enter a reserved test mode, so exercise caution if

 

 

you use this pin for input. If you choose to configure this pin as an input, always

 

 

hold it high during reset and ensure that your system meets the VIH specification

 

 

(see datasheet) to prevent inadvertent entry into a test mode.

 

 

Port 5 is multiplexed as follows: P5.0/ALE/ADV#/SLPALE, P5.1/INST/SLPCS#,

 

 

P5.2/WR#/WRL#/SLPWR#, P5.3/RD#/SLPRD#, /SLPINT, P5.5/BHE#/WRH#,

 

 

P5.6/READY, and P5.7/BUSWIDTH.

A-9

Page 129 Page 131
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Intel 87C196CB, 8XC196NT user manual P2.6/HLDA#/ONCE#/CPVER, P2.7/CLKOUT/PACT#
Page 129 Page 131

8XC196NT, 87C196CB specifications

The Intel 87C196CB and 8XC196NT are microcontrollers from the C196 family, which was designed to meet the demands of embedded control technology. These microcontrollers are popular in various applications due to their robust architecture, extensive I/O capabilities, and specialized functionality, making them ideal for automotive, industrial, and communication systems.

The 87C196CB is distinguished by its 16-bit architecture, offering a balance of processing power and efficiency. It features a 16-bit data bus, which allows for fast data processing, and a 16-bit address bus, supporting up to 64KB of program memory. The microcontroller integrates on-chip memory, including 2KB of ROM and 128 bytes of RAM, which facilitates faster execution of programs and data handling.

One of the standout features of the 87C196CB is its versatility in I/O operations. It comes equipped with 32 general-purpose I/O lines that can be configured for various functions, including input, output, and interrupt handling. This flexibility enables developers to optimize the microcontroller for their specific application needs.

The 8XC196NT builds on the capabilities of its predecessor, offering advanced functionalities such as an enhanced instruction set and integrated peripherals. It includes additional features like timers, serial communication interfaces, and analog-to-digital converters, which expand its usability in complex embedded systems. The 8XC196NT supports multiple addressing modes, allowing for more efficient programming and memory management.

Both microcontrollers utilize innovative technologies that improve performance and power efficiency. The on-chip operating system support aids in real-time processing and multitasking, making them suitable for time-sensitive applications. Power management features are also incorporated, allowing these microcontrollers to operate in low-power modes, which is crucial for battery-operated devices.

The 87C196CB and 8XC196NT microcontrollers are characterized by their reliability and long service life, meeting the stringent demands of industrial applications. Their ability to perform tasks rapidly, combined with their diverse peripheral support, makes them popular choices among engineers and developers designing embedded systems. Overall, the Intel 87C196CB and 8XC196NT microcontrollers remain relevant in the rapidly evolving landscape of embedded technology, facilitating innovative solutions across various industries.
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