AS87196CB datasheet(9/33 Pages) INTEL

9 / 33 page

87C196CA87C196CB

Symbol

Name and Function

PORT 3 and 4

8-bit bidirectional IO ports with open drain outputs These pins are shared with the

multiplexed addressdata bus which has strong internal pullups

P27CLKOUT

Output of the internal clock generator The frequency is the oscillator frequency

CLKOUT has a 50% duty cycle Also LSIO pin when not used as CLKOUT

P26HLDA

Bus Hold Acknowledge Active-low output indicates that the bus controller has

relinquished control of the bus Occurs in response to an external device asserting the

HLD

signal Also LSIO when not used as HLDA

P25HLD

Bus Hold Active-low signal indictes that an external device is requesting control of the

bus Also LSIO when not used as HLD

(CB only)

P24INTOUT

Interrupt Output This active-low output indicates that a pending interrupt requires use

of the external bus Also LSIO when not used as INTOUT

P23BREQ

Bus Request This active-low output signal is asserted during a HOLD cycle when the

bus controller has a pending external memory cycle Also LSIO when not used as

(CB only)

BREQ

P22EXTINT

A positive transition on this pin causes a maskable interrupt vector through memory

location 203CH Also LSIO when not used as EXTINT

P21RXD

Receive data input pin for the Serial IO port Also LSIO if not used as RXD

P20TXD

Transmit data output pin for the Serial IO port Also LSIO if not used as TXD

PORT 1EPA0 – 7

Dual function IO port pins Primary function is that of bidirectional IO System function

is that of High Speed capture and compare EPA0 and EPA2 have another function of

T2CLK and T2DIR of the TIMER2 timercounter

PORT 0ACH0 – 7

8-bit high impedance input-only port These pins can be used as digital inputs andor as

analog inputs to the on-chip AD converter These pins are also used as inputs to

EPROM parts to select the Programming Mode

EPORT

8-bit bidirectional standard and IO Port These bits are shared with the extended

address bus A16 – A19 for CB PLCC A16 – A23 for CB QFP Pin function is selected on

(CB only)

a per pin basis

TXCAN

Push-pull output to the CAN bus line

RXCAN

High impedance input-only from the CAN bus line

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