AN87C196CB-20 Ver la hoja de datos (PDF) - Intel

Número de pieza

componentes Descripción

Fabricante

AN87C196CB-20

ADVANCED 16-BIT CHMOS MICROCONTROLLER WITH INTEGRATED CAN 2.0

Intel 

87C196CA 87C196CB

Symbol

VCC

VSS VSS1

VREF

ANGND

VPP

XTAL1

XTAL2

RESET

NMI

EA

PLLEN

(196CB only)

P6 4–6 7 SSIO

P6 3 T1DIR

(CB only)

P6 2 T1CLK

(CB only)

P6 0–6 1 EPA8– 9

Name and Function

Main Supply Voltage (a5V)

Digital circuit ground (0V) There are 7 VSS pins CB (4 on CA) all of which MUST be

connected to a single ground plane

Reference for the A D converter (a5V) VREF is also the supply voltage to the analog

portion of the A D converter and the logic used to read Port 0 Must be connected for

A D and Port 0 to function

Reference ground for the A D converter Must be held at nominally the same potential

as VSS

Programming voltage for EPROM parts It should be a12 5V for programming It is

also the timing pin for the return from powerdown circuit Connect this pin with a 1 mF

capacitor to VSS and a 1Mohm resistor to VCC If this function is not used VPP may be

tied to VCC

Input of the oscillator inverter and the internal clock generator

Output of the Oscillator Inverter

Reset input to the chip Input low for at least 16 state times will reset the chip The

subsequent low to high transition resynchronizes CLKOUT and commences a

10-state time sequence in which the PSW is cleared bytes are read from 2018H

201Ah and 201CH (if enabled) loading the CCB’s and a jump to location 2080H is

executed Input high for normal operation RESET has an internal pullup

A positive transition causes a non-maskable interrupt vector through memory location

203EH If not used this pin should be tied to VSS May be used by Intel Evaluation

boards

Input for memory select (External Access) EA equal to a high causes memory

accesses to locations 0FF2000H through 0FFFFFFH to be directed to on-chip

EPROM ROM EA equal to a low causes accesses to these locations to be directed

to off-chip memory EA e a12 5V causes execution to begin in the Programming

Mode EA is latched at reset

Selects between PLL mode or PLL bypass mode This pin must be either tied high or

low PLLEN pin e 0 bypass PLL mode PLLEN pin e 1 places a 4x PLL at the input

of the crystal oscillator Allows for a low frequency crystal to drive the device (i e

5 MHz e 20 MHz operation)

Dual function I O ports have a system function as Synchronous Serial I O Two pins

are clocks and two pins are data providing for full duplex capability Also LSIO when

not used as SSIO

Dual function I O pin Primary function is that of a bidirectional I O pin however it

may also be used as a TIMER1 Direction input The TIMER1 will increment when this

pin is high and decrements when this pin is low

Dual function I O pin Primary function is that of a bidirectional I O pin however may

also be used as a TIMER1 Clock input The TIMER1 will increment or decrement on

both positive and negative edges of this pin

Dual function I O port pins Primary function is that of bidirectional I O System

function is that of High Speed capture and compare

7

Share Link: