80C196NU Intel Corporation, 80C196NU Datasheet - Page 22

• Manufacturer Part Number: 80C196NU
• Description: COMMERCIAL CHMOS MICROCONTROLLER
• Manufacturer: Intel Corporation

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8XC196NU COMMERCIAL CHMOS 16-BIT MICROCONTROLLER
18
WRL#
XTAL1
XTAL2
Name
Type
O
O
I
Write Low
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.
WRL# is multiplexed with WR#.
†
Input Crystal/Resonator or External Clock Input
Input to the on-chip oscillator, phase-locked loop circuitry, 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 V
Inverted Output for the Crystal/Resonator
Output of the on-chip oscillator inverter. Leave XTAL2 floating when the design
uses a external clock source instead of the on-chip oscillator.
The chip configuration register 0 (CCR0) determines whether this pin func-
tions as WR# or WRL#. CCR0.2 = 1 selects WR#; CCR0.2 = 0 selects WRL#.
Table 8. Signal Descriptions (Continued)
†
IH
specification for XTAL1 (see datasheet).
Description
PRELIMINARY