EN80C186EA25 데이터 시트보기 (PDF) - Intel

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EN80C186EA25

16-Bit High-Integration Embedded Processors

Intel 

Intel® 80C186EA Peripheral Architecture

3.7

80C187 Interface (80C186EA Only)

The 80C187 Numerics Coprocessor may be used to extend the 80C186EA instruction set to

include floating point and advanced integer instructions. Connecting the 80C186EA RESOUT and

TEST/ BUSY pins to the 80C187 enables Numerics Mode operation. In Numerics Mode, three of

the four Mid- Range Chip Select (MCS) pins become handshaking pins for the interface. The

exchange of data and control information proceeds through four dedicated I/O ports.

If an 80C187 is not present, the 80C186EA configures itself for regular operation at reset.

Note: The 80C187 is not specified for 3V operation and therefore does not interface directly to the 80L186EA.

3.8

ONCE Test Mode

To facilitate testing and inspection of devices when fixed into a target system, the 80C186EA has a

test mode available which forces all output and input/ output pins to be placed in the high-

impedance state. ONCE stands for “ON Circuit Emulation.” The ONCE mode is selected by

forcing the UCS and LCS pins LOW (0) during a processor reset (these pins are weakly held to a

HIGH (1) level) while RESIN is active.

Product Name Datasheet

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