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參數(shù)資料
| 型號： | PIC14000 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CTV 22C 22#22D SKT RECP |
| 中文描述： | 28引腳可編程混合信號控制器 |
| 文件頁數(shù)： | 79/152頁 |
| 文件大?。?/td> | 953K |
| 代理商： | PIC14000 |
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1996 Microchip Technology Inc.
Preliminary
DS40122B-page 79
PIC14000
10.4
Low-Voltage Detector
The PIC14000 contains an integrated low-voltage
detector. The supply voltage is divided and compared
to the bandgap reference output. If the supply voltage
(V
DD
) falls below V
TRIP
-, then the low-voltage detector
will cause LVD (PCON<0>) to be reset. This bit can be
read by software to determine if a low voltage condition
occurred. This bit must be set by software.
The nominal values of the low-voltage detector trip
points are as follows:
V
TRIP
- = 2.55V
V
TRIP
+ = 2.60V
Hysteresis (V
TRIP
+ – V
TRIP
-) = 55 mV
10.5
Power-on Reset (POR), Power-up
Timer (PWRT) and Oscillator Start-up
Timer (OST)
10.5.1
POWER-ON RESET (POR)
A Power-on Reset pulse is generated on-chip when
V
DD
rise is detected (in the range of 1.5V - 2.1V). To
take advantage of the POR, just tie the MCLR pin
directly (or through a resistor) to V
nate external RC components usually needed to create
a Power-on Reset. A maximum rise time for V
specified. See Electrical Specifications for details.
When the device starts normal operation (exits the
reset condition), device operating parameters (voltage,
frequency, temperature, ...) must be met to ensure
operation. If these conditions are not met, the device
must be held in reset until the operating conditions are
met.
For additional information, refer to Application Note
AN607, “
Power-up Trouble Shooting
DD
. This will elimi-
DD
is
.”
10.5.2
POWER-UP TIMER (PWRT)
The Power-up Timer provides a fixed 72 ms (nominal)
time-out on power-up only, from POR. The power-up
timer operates from a local internal oscillator. The chip
is kept in reset as long as PWRT is active. The PWRT
delay allows the V
DD
to rise to an acceptable level. A
configuration bit, PWRTE, can disable (if set, or unpro-
grammed) or enable (if cleared, or programmed) the
power-up timer.
The power-up timer delay will vary from chip to chip
and due to V
DD
and temperature.
10.5.3
OSCILLATOR START-UP TIMER (OST)
The Oscillator Start-up Timer (OST) provides 1024
oscillator cycles (from OSC1 input) delay after the
PWRT delay is over. This guarantees that the crystal
oscillator or resonator has started and stabilized.
10.5.4
IN OSCILLATOR START-UP
There is an 8-cycle delay in IN mode to ensure stability
only after a Power-on Reset (POR) or wake-up from
SLEEP.
TABLE 10-3:
STATUS BITS AND THEIR SIGNIFICANCE
POR
TO
PD
Meaning
0
1
1
Power-On Reset
Illegal, TO is set on POR
Illegal, PD is set on POR
WDT reset during normal operation
WDT time-out wakeup from sleep
MCLR reset during normal operation
MCLR reset during SLEEP or HIBERNATE, or interrupt wake-up from
SLEEP or HIBERNATE.
0
0
X
0
X
0
1
0
1
1
0
0
1
1
1
1
1
0
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC14000/JW | 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC14000-04/SO | 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC14000-04/SP | 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| PIC14000-04/SP | 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 14000 SDIL28 |
| PIC14000-04/SS | 功能描述:8位微控制器 -MCU 7KB 192 RAM 20 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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