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CDP1806ACEX 数据表(PDF) 14 Page - Intersil Corporation

部件名 CDP1806ACEX
功能描述  CMOS 8-Bit Microprocessor with On-Chip RAM and Counter/Timer
PDF  30 Pages
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制造商  INTERSIL [Intersil Corporation]
网页  http://www.intersil.com/cda/home
标志 INTERSIL - Intersil Corporation

CDP1806ACEX 数据表(HTML) 14 Page - Intersil Corporation

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14
Because of the Schmitt Trigger input, an RC oscillator can
be used as shown in Figure 9. The frequency is approxi-
mately 1/RC (see Figure 10).
STPC
R
÷ 32
TPA
STM
SPMI
INH
OUT
8-BIT
DOWN
COUNTER
LOAD
READ
SCMI
SPM2
SCM2
DTC
GEC
COUNTER
UNDERFLOW
ETQ
LDC
TO INTERRUPT LATCH
C
Q FF
DQ
Q
Q OUTPUT
EF2
EF1
FIGURE 7. TIMER/COUNTER DIAGRAM
†
Pin numbers refer to 40 pin DIP.
FIGURE 8. TYPICAL 5MHz CRYSTAL OSCILLATOR
†
Pin numbers refer to 40 pin DIP.
FIGURE 9. RC NETWORK FOR OSCILLATOR
1
39 XTAL †
CIN
XTAL
5MHz PARALLEL
RESONANT
CRYSTAL
15pF
COUT
27pF
1M
Ω
RF
CLOCK†
1
39 XTAL †
C
R
CLOCK†
FIGURE 10. NOMINAL COMPONENT VALUES AS A FUNCTION
OF FREQUENCY FOR THE RC OSCILLATOR
CONTROL MODES
CLEAR
WAIT
MODE
LL
Not Allowed
L
H
Reset
H
L
Pause
HH
Run
10M
1M
100K
10K
11M
10
100
1K
10K
100K
FREQUENCY (Hz)
VDD = 5V AT 25
oC
C
=
1µ
pF
C
=
0.1µ
F
C
=
0.0
1µ
F
C
=
10
00
pF
C
=
10
0p
F
CDP1805AC, CDP1806AC



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