87C196 Intel Corporation, 87C196 Datasheet - Page 7

• Manufacturer Part Number: 87C196
• Description: CHMOS 16-BIT MICROCONTROLLER
• Manufacturer: Intel Corporation

V
V
V
ANGND
V
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
CC
SS
REF
PP
V
Symbol
SS1
Main Supply Voltage (
Digital circuit ground (0V) There are 7 V
connected to a single ground plane
Reference for the A D converter (
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 V
Programming voltage for EPROM parts It should be
also the timing pin for the return from powerdown circuit Connect this pin with a 1 F
capacitor to V
tied to V
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
A positive transition causes a non-maskable interrupt vector through memory location
203EH If not used this pin should be tied to V
boards
Input for memory select (External Access) EA
accesses to locations 0FF2000H through 0FFFFFFH to be directed to on-chip
EPROM ROM EA
to off-chip memory EA
Mode EA
Selects between PLL mode or PLL bypass mode This pin must be either tied high or
low PLLEN pin
of the crystal oscillator Allows for a low frequency crystal to drive the device (i e
5 MHz
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
SS
e
CC
20 MHz operation)
is latched at reset
SS
e
and a 1Mohm resistor to V
0 bypass PLL mode PLLEN pin
equal to a low causes accesses to these locations to be directed
a
5V)
e a
12 5V causes execution to begin in the Programming
Name and Function
a
5V) V
SS
REF
pins CB (4 on CA) all of which MUST be
CC
SS
is also the supply voltage to the analog
If this function is not used V
equal to a high causes memory
May be used by Intel Evaluation
e
has an internal pullup
a
1 places a 4x PLL at the input
12 5V for programming It is
87C196CA 87C196CB
PP
may be
7