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參數(shù)資料
| 型號： | COP413C |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Single-Chip CMOS Microcontrollers |
| 中文描述： | 單芯片的CMOS微控制器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 223K |
| 代理商： | COP413C |
Functional Description
(Continued)
HALT MODE
The COP413C is afully static circuit; therefore, the user may
stop the system oscillator at any time to halt the chip. The
chip may be halted by the HALT instruction. Once in the
HALT mode, the internal circuitry does not receive any clock
signal, and is therefore frozen in the exact state it was in
when halted. All information is retained until continuing. The
HALT mode is the minimum power dissipation state.
The HALT mode may be entered into by program control
(HALT instruction) which forces CKO to a logic ‘‘1’’ state.
The circuit can be awakened only by the RESET function.
POWER DISSIPATION
The lowest power drain is when the clock is stopped. As the
frequency increases so does current. Current is also lower
at lower operating voltages. Therefore, to minimize power
consumption, the user should run at the lowest speed and
voltage that his application will allow. The user should take
care that all pins swing to full supply levels to ensure that
outputs are not loaded down and that inputs are not at
some intermediate level which may draw current. Any input
with a slow rise or fall time will draw additional current. A
crystal- or resonator-generated clock will draw more than a
square-wave input. An RC oscillator will draw even more
current since the input is a slow rising signal.
If using an external squarewave oscillator, the following
equation can be used to calculate the COP413C current
drain.
Ic
e
Iq
a
(V
c
20
c
Fi)
a
(V
c
1280
c
Fl/Dv)
where Ic
e
chip current drain in microamps
Iq
e
quiescent leakage current (from curve)
Fl
e
CKI frequency in megahertz
V
e
chip V
CC
in volts
Dv
e
divide by option selected
For example, at 5V V
CC
and 400 kHz (divide by 8),
Ic
e
30
a
(5
c
20
c
0.4)
a
(5
c
1280
c
0.4/8)
Ic
e
30
a
40
a
320
e
390
m
A
OSCILLATOR OPTIONS
There are two options available that define the use of CKI
and CKO.
a. Cyrstal-Controlled Oscillator. CKI and CKO are connect-
ed to an external crystal. The instruction cycle time
equals the crystal frequency divided by 8.
b. RC-Controlled Oscillator. CKI is configured as a single
pin RC-controlled Schmitt trigger oscillator. The instruc-
tion cycle equals the oscillation frequency divided by 4.
CKO is NC.
The RC oscillator is not recommended in systems that re-
quire accurate timing or low current. The RC oscillator
draws more current than an external oscillator (typically an
additional 100
m
A at 5V). However, when the part halts, it
stops with CKI high and the halt current is at the minimum.
TL/DD/8537–6
FIGURE 6. COP413C Oscillator
Crystal or Resonator
RC-Controlled
Oscillator
Crystal
Value
Component Value
C1 pF
Cycle
Time
R1
R2
C2 pF
R
C
V
CC
32 kHz
455 kHz
2.000 MHz
220k
5k
2k
20M
10M
1M
30
80
30
5–36
40
6–36
15k
30k
47k
56k
Note: 15k
s
R
s
150k,
50 pF
s
C
s
150 pF
82 pF
82 pF
100 pF
100 pF
4–9
m
s
8–16
m
s
16–32
m
s
16–32
m
s
t
4.5V COP413CH Only
t
4.5V COP413CH Only
3.0 to 4.5V COP413C Only
t
4.5V
9
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| COP472-3 | COP472-3 Liquid Crystal Display Controller |
| COP472MW-3 | COP472-3 Liquid Crystal Display Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| COP413CH | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Single-Chip CMOS Microcontrollers |
| COP413CH-XXX/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| COP413CH-XXX/N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| COP413C-XXX/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| COP413C-XXX/N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
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