AS87196CB datasheet(7/33 Pages) INTEL

7 / 33 page

87C196CA87C196CB

Symbol

Name and Function

VCC

Main Supply Voltage (a5V)

VSS VSS1

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

connected to a single ground plane

VREF

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

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

AD and Port 0 to function

ANGND

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

as VSS

VPP

Programming voltage for EPROM parts It should be a125V 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

XTAL1

Input of the oscillator inverter and the internal clock generator

XTAL2

Output of the Oscillator Inverter

RESET

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

NMI

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

EPROMROM EA

equal to a low causes accesses to these locations to be directed

to off-chip memory EA

125V causes execution to begin in the Programming

Mode EA

is latched at reset

PLLEN

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

(196CB only)

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

5 MHz e 20 MHz operation)

P64 – 67SSIO

Dual function IO ports have a system function as Synchronous Serial IO Two pins

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

not used as SSIO

P63T1DIR

Dual function IO pin Primary function is that of a bidirectional IO pin however it

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

(CB only)

pin is high and decrements when this pin is low

P62T1CLK

Dual function IO pin Primary function is that of a bidirectional IO pin however may

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

(CB only)

both positive and negative edges of this pin

P60 – 61EPA8 – 9

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

function is that of High Speed capture and compare

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