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808SA/808SA-2
SINGLE CHIP 8-BIT N-CHANNEL MICROPROCESSORS
•
Single +5V Power Supply
•
Four Vectored
Interrupt
Inputs
(One
is
•
100%
Software Compatible
with
SOSOA
Non-Maskable) Plus an
SOSOA-
..
1.3
p,s
Instruction Cycle
(SOS5A);
Compatible
Interrupt
O.S
p,s
(SOS5A-2)
•
Serial In/Serial
Out
Port
•
On-Chip
Clock
Generator (with External
Decimal, Binary and
Double Precision
Crystal, LC
or
RC Network)
•
Arithmetic
•
On-Chip
System Controller; Advanced
Cycle
Status Information Available
for
•
Direct Addressing
Capability to 64k
Large
System Control
Bytes
of
Memory
The
Intel@ 8085A is a complete 8
bit
parallel Central Processing
Unit
(CPU). Its instruction set is 100% software compatible
with
the 8080A microprocessor, and
it
is designed
to
improve the present
80BOA's
performance by higher system speed.
Its high level
of
system integration allows a
minimum
system
of
three IC's [8085A (CPU), 8156 (RAM/IO) and 8355/8755A
(ROM/PROM/IO)]
while
maintaining total system expandability. The 8085A-2 is a faster version
of
the 8085A.
The 8085A incorporates all
of
the
features that the 8224
(clock
generator) ,and 8228 (system controller) provided
for
the
8080A, thereby
offering
a high level
of
system integration.
The
8085A uses a multiplexed data bus.
The
address is split between the 8 bit address bus and the 8
bit
data bus. The
on-chip
address latches
of
8155/8156/8355/8755A
memory
products allow a direct interface
with
the 8085A.
X,
X2
IN'TA
RST6.5
1~::~)!: ~
}~~~I!~ER
INCREMENTER/DECREMENTER
ADDRESS
LATCH
116)
A1S-AS
ADDRESS BUS
Figure 1. 8085A
CPU
Functional
Block
Diagram
6-26
AD7-ADO
ADDRESS/DATA
BUS
Xl
X2
,RESET OUT
SOD
SID
TRAP
Vee
HOLD
HlDA
elK
(OUT)
RESET IN
READY
RST
7.5
101M
RST
6,5
Sl
RST
5.5
AD
INTR
WR
INTA
ALE
ADO
So
ADI
A15
AD2
A14
AD3
A13
AD4
A12
AD5
All
AD6
AlO
AD7 Ag
VSS
...
___
r
AS
Figure 2. 808SA Pin
Configuration
AFN-01242C