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參數(shù)資料
| 型號(hào)： | COP310C |
| 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(yè)數(shù)： | 9/20頁(yè) |
| 文件大?。?/td> | 313K |
| 代理商： | COP310C |
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Functional Description
(Continued)
HALT MODE
The COP410C/411C is a fully static circuit; therefore, the
user may stop the system oscillator at any time to halt the
chip. The chip also may be halted by the HALT instruction or
by forcing CKO high when it is used as a HALT I/O port.
Once in the HALT mode, the internal circuitry does not re-
ceive 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 dissipa-
tion state.
The HALT mode has slight differences depending upon the
type of oscillator used.
a. 1-pin oscillatorDRC or external
The HALT mode may be entered into by either program
control (HALT instruction) or by forcing CKO to a logic
‘‘1’’ state.
The circuit may be awakened by one of two different
methods:
1) Continue function. By forcing CKO to a logic ‘‘0’’, the
system clock is re-enabled and the circuit continues to
operate from the point where it was stopped.
2) Restart. Forcing the RESET pin to a logic ‘‘0’’ will re-
start the chip regardless of HALT or CKO (see initiali-
zation).
b. 2-pin oscillatorDcrystal
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.
TL/DD/5015–7
Halt I/O Port
CKO Pin Options
In a crystal-controlled oscillator system, CKO is used as an
output to the crystal network. CKO will be forced high during
the execution of a HALT instruction, thus inhibiting the crys-
tal network. If a 1-pin oscillator system is chosen (RC or
external), CKO will be selected as HALT and is an I/O
flip-flop which is an indicator of the HALT status. An exter-
nal signal can override this pin to start and stop the chip. By
forcing a high level to CKO, the chip will stop as soon as
CKI is high and the CKO output will go high to keep the chip
stopped. By forcing a low level to CKO, the chip will contin-
ue and CKO output will go low.
All features associated with the CKO I/O pin are available
with the 24-pin package only.
OSCILLATOR OPTIONS
There are three options available that define the use of CKI
and CKO.
a. Crystal-Controlled Oscillator. CKI and CKO are connect-
ed to an external crystal. The instruction cycle time
equals the crystal frequency divided by 16 (optionally by 8
or 4).
b. External Oscillator. CKI is configured as LSTTL-compati-
ble input accepting an external clock signal. The external
frequency is divided by 16 (optionally by 8 or 4) to give
the instruction cycle time. CKO is the HALT I/O port.
c. RC-Controlled Oscillator. CKI is configured as a single pin
RC-controlled Schmitt trigger oscillator. The instruction
cycle equals the oscillation frequency divided by 4. CKO
is the HALT I/O port.
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/5015–8
FIGURE 6. COP410C Oscillator
Crystal or Resonator
RC-Controlled
Oscillator
Crystal
Value
Component Value
R2
C1 pF
Cycle
Time
R1
C2 pF
R
C
V
CC
32 kHz
455 kHz
2.096 MHz
4.0 MHz
220k
5k
2k
1k
20M
10M
1M
1M
30
80
30
30
5-36
40
6-36
6-36
15k
30k
47k
Note: 15k
s
R
s
150k,
50 pf
s
C
s
150 pF
82 pF
82 pF
100 pF
4-9
m
s
8-16
m
s
16-32
m
s
t
4.5V
t
4.5V
2.4 to 4.5
9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| COP311C | Single-Chip CMOS Microcontrollers |
| COP410L | Single-Chip N-Channel Microcontrollers |
| COP411L | Single-Chip N-Channel Microcontrollers |
| COP310L | Single-Chip N-Channel Microcontrollers |
| COP311L | Single-Chip N-Channel Microcontrollers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| COP310C-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 |
| COP310C-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 |
| COP310C-XXX/WM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| COP310L | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Single-Chip N-Channel Microcontrollers |
| COP310L-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 |
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