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APPLICATION EXAMPLES
5.0 Introduction
The following chapter
is
organized
in
two
sections, Hardware and Software. The
hardware section gives
examples of some
typical configurations of MCS-48 compon-
ents
while software section gives assembly
language listings
of some common appli-
cations routines.
5.1
Hardware Examples
CRYSTAL OSCILLATOR MODE
<
15
pF
(INCLUDES XTAL,
SOC~ET,
STRAY)
r-----
I
I
I
..L
..
I
I
I
L
____
_
15-25pF
(INCLUDES SOCKET, I
STRAY)
":'
XTAll
CRYSTAL SERIES RESISTANCE SHOULD
BE
<7512
AT 6 MHz; <1601l
AT
3.6
MHz.
NOTE:
DRIVING FROM EXTERNAL SOURCE
+5V
47012
Jo-4------'"
2~
XTAll
+5V
47012
L---'--~XTAL2
BOTH
XTAll
AND
XTAl2
SHOULD
BE
DRIVEN.
RESISTORS
TO
Vee ARE
NEEDED
TO
ENSURE
V,H
=
3.8V
IF TTL CIRCUITRY IS
USED.
LC OSCILLATOR MODE
A
STANDARD
SERIES RESONANT
XTAL
SUCH
AS
CTS KNIGHTS MP060
OR
CRYSTEK CY6B
WILL
PROVIDE BETTER THAN .1% FRE·
QUENCY
ACCURACY.
--"-
J;..
NOMINAL'
EACH C SHOULD
BE
APPROXIMATELY 20pF,
INCLUDING
STRAY CAPACITANCE. FOR
MORE
INFORMATION
ON XTALS SEE INTEl-
APPLICATION NOTE AP.35.
FREQUENCY REFERENCE OPTIONS
45
.H
20
pF 5.2 MHz
12O.H 20pF 3.2
MHZ..--_..-_-42
XTAll
C
'-
C+3Cpp
- 2
L---_~_~3
XTAl2
Cpp
" 5 -
10
pF PlN·TO·PIN
CAPACITANCE
EACH C SHOULD
BE
APPROXIMATELY
20
pF. INCLUDING STRAY CAPACITANCE.
5·1
NOTE: SEE PAGE 5·3 FOR
6021
FREQUENCY REFERENCES.