87C196LA 查看數據表（PDF） - Intel

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87C196LA

CHMOS 16-BIT MICROCONTROLLER

Intel 

87C196LA — AUTOMOTIVE

Name

WRL#

XTAL1

XTAL2

Type

O

I

O

Table 4. Signal Descriptions (Continued)

Description

Write Low†

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

writes and word writes to external memory. During 8-bit bus cycles, WRL# is

asserted for all write operations.

WRL# shares a package pin with P5.2, WR#, and PLLEN.

† When this pin is configured as a special-function signal (P5_MODE.2 = 1), the

chip configuration register 0 (CCR0) determines whether it functions as WR#

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

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.

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.

14

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