87C196LA Intel Corporation, 87C196LA Datasheet - Page 14

• Manufacturer Part Number: 87C196LA
• Description: CHMOS 16-BIT MICROCONTROLLER
• Manufacturer: Intel Corporation

14
87C196LA — AUTOMOTIVE
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 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.
†
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 V
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.
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#.
Table 4. Signal Descriptions (Continued)
†
Description
PRODUCT PREVIEW
IH