AN87C196CB 查看數據表（PDF） - Intel

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AN87C196CB

ADVANCED 16-BIT CHMOS MICROCONTROLLER WITH INTEGRATED CAN 2.0

Intel 

87C196CA 87C196CB

Symbol

Name and Function

PORT 3 and 4

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

P2 7 CLKOUT

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

P2 6 HLDA

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

P2 5 HLD

(CB only)

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

bus Also LSIO when not used as HLD

P2 4 INTOUT

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

of the external bus Also LSIO when not used as INTOUT

P2 3 BREQ

(CB only)

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

BREQ

P2 2 EXTINT

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

location 203CH Also LSIO when not used as EXTINT

P2 1 RXD

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

P2 0 TXD

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

PORT 1 EPA0– 7 Dual function I O port pins Primary function is that of bidirectional I O System function

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

T2CLK and T2DIR of the TIMER2 timer counter

PORT 0 ACH0– 7 8-bit high impedance input-only port These pins can be used as digital inputs and or as

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

EPROM parts to select the Programming Mode

EPORT

(CB only)

8-bit bidirectional standard and I O 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

a per pin basis

TXCAN

Push-pull output to the CAN bus line

RXCAN

High impedance input-only from the CAN bus line

9

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