80C196NP Просмотр технического описания (PDF) - Intel

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80C196NP

COMMERCIAL CHMOS 16-BIT MICROCONTROLLER

Intel 

8XC196NP COMMERCIAL CHMOS 16-BIT MICROCONTROLLER

Name

TXD

VCC

VSS

WR#

WRH#

WRL#

XTAL1

XTAL2

Table 8. Pin Descriptions (Continued)

Type

Description

Multiplexed

with

O Transmit Serial Data

P2.0

In serial I/O modes 1, 2, and 3, TXD is used to transmit serial port

data. In mode 0, it is used as the serial clock output.

PWR Digital Supply Voltage

—

Connect each VCC pin to the digital supply voltage.

GND Digital Circuit Ground

—

Connect each VSS pin to ground through the lowest possible

impedance path.

O Write

WRL#

This active-low output indicates that an external write is occurring.

This signal is asserted only during external memory writes.

The chip configuration register 0 (CCR0) determines whether this

pin functions as WR# or WRL#. CCR0.2=1 selects WR#; CCR0.2=0

selects WRL#.

O Write High

BHE#

During 16-bit bus cycles, this active-low output signal is asserted for

high-byte writes and word writes to external memory. During 8-bit

bus cycles, WRH# is asserted for all write operations.

The chip configuration register 0 (CCR0) determines whether this

pin functions as BHE# or WRH#. CCR0.2=1 selects BHE#;

CCR0.2=0 selects WRH#.

O Write Low

WR#

During 16-bit bus cycles, this active-low output signal is asserted for

low-byte writes and word writes. During 8-bit bus cycles, WRL# is

asserted for all write operations.

The chip configuration register 0 (CCR0) determines whether this

pin functions as WR# or WRL#. CCR0.2=1 selects WR#; CCR0.2=0

selects WRL#.

I Input Crystal/Resonator or External Clock Input

—

Input to the on-chip oscillator and the internal clock generators. The

internal clock generators provide the peripheral clocks, CPU clock,

and CLKOUT signal. When using an external clock source instead

of the on-chip oscillator, connect the clock input to XTAL1. The

external clock signal must meet the VIH specification for XTAL1.

O Inverted Output for the Crystal/Resonator

—

Output of the on-chip oscillator inverter. Leave XTAL2 floating when

the design uses an external clock source instead of the on-chip

oscillator.

ELECTRICAL CHARACTERISTICS

16

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