Radio Shack TRS-80 Service Manual page 5
Pocket computer printer and cassette interface
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Also See for TRS-80:
- Reference manual (274 pages) ,
- User manual (236 pages) ,
- Service manual (199 pages)
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2-1
.
RAM
MAP
USER
MEMORY
2KB USER
M
EMORY STANDARD
2-2.
LSI
signa
l
description
1.
LH5801
(8-blt CMOS
MPU)
1)
Outline
USER MEMORY
OPTION
IOKB
PV
PV
EXPAND
ROMO
16
K8
SYSTEM
PROGRAM 16KB
EXPAND
ROM
I
16KB
*
:
Inhibit
to use by redundancy
0000
l'Fff
so
SI
S2
S3
S4
S5
S6
S7
YO
YI
Y2
Ya
The
LHS801
Is
the 8-bit
microprocessor
of the CMOS stalic
type,
featuring very
low
p0wer dissipation 1111d
taiie
data
processing capability. The MPU inc<>rporat01 functions Suth aa the LCD
backplate
signal
generator,
input poll, external
latch
clock and timer,
and allows a variety
of SY•tems
with
ralativety few
chips.
2)
Ft11Ures
of
MPU
(Micro
Processing Unit)
•
8-bit pa,,.llel
operations
•
I
28KB direct
accessing
•
Implementation
of
6·byt
e general purpose
register besides the occumulator
while allows the
use
of
three
data pointers.
•
9·blt
timer
function
•
Tluec
kinds of
interrupts
Non·maskable Interrupt
Maskllblc
Interrupt
Tlrner
interrupt
•
Instruction
set
of 80 kinds
•
OMA and multiprocessor capabilities
•
MJ>U
wait function
(memory
accessconllol)
•
Implementation of 8-l>il
input
p0n
and clock
P~
for
c~1cmal
latch
•
Memory backup
function
•
LCD back plate
control
•
Clock 2.6MHt (crystal control)
Internal machine cycle ......
I .3MHz
Min.lnu1n
instruction
cxcute
time
...... l
.3µS
-2-
Do not
sale
this PDF
!!!
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