AN87C196KC Ver la hoja de datos (PDF) - Rochester Electronics

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componentes Descripción

Fabricante

AN87C196KC

POWERFUL MICROCONTROLLER for use in the automotive market

Rochester Electronics 

8XC196KC/8XC196KC20

PIN DESCRIPTIONS (Continued)

Symbol

Ports 3 and 4

Name and Function

8-bit bidirectional I/O ports with open drain outputs. These pins are shared with the

multiplexed address/data bus which has strong internal pullups.

HOLD

Bus Hold input requesting control of the bus.

HLDA

Bus Hold acknowledge output indicating release of the bus.

BREQ

PMODE

PACT

Bus Request output activated when the bus controller has a pending external memory

cycle.

Determines the EPROM programming mode.

A low signal in Auto Programming mode indicates that programming is in process. A high

signal indicates programming is complete.

CPVER

PALE

PROG

Cummulative Program Output Verification. Pin is high if all locations have programmed

correctly since entering a programming mode.

A falling edge in Slave Programming Mode and Auto Configuration Byte Programming Mode

indicates that ports 3 and 4 contain valid programming address/command information

(input to slave).

A falling edge in Slave Programming Mode indicates that ports 3 and 4 contain valid

programming data (input to slave).

PVER

AINC

A high signal in Slave Programmig Mode and Auto Configuration Byte Programming Mode

indicates the byte programmed correctly.

Auto Increment. Active low input signal indicates that the auto increment mode is enabled.

Auto Increment will allow reading or writing of sequential EPROM locations without address

transactions across the PBUS for each read or write.

8

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