- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄368024 > PIC16C621 (Microchip Technology Inc.) EPROM-Based 8-Bit CMOS Microcontroller(每個I/O口有25mA驅(qū)動/吸收電流,可編程參考電壓，微控制器) PDF資料下載
參數(shù)資料
| 型號： | PIC16C621 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | EPROM-Based 8-Bit CMOS Microcontroller(每個I/O口有25mA驅(qū)動/吸收電流,可編程參考電壓，微控制器) |
| 中文描述： | 存儲器為基礎(chǔ)的8位CMOS微控制器（每個的I / O口有25毫安驅(qū)動/吸收電流，可編程參考電壓，微控制器） |
| 文件頁數(shù)： | 50/112頁 |
| 文件大?。?/td> | 1205K |
| 代理商： | PIC16C621 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁當(dāng)前第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁
PIC16C62X(A)
DS30235F-page 50
Preliminary
1997 Microchip Technology Inc.
9.4
Power-on Reset (POR), Power-up
Timer (PWRT), Oscillator Start-up
Timer (OST) and Brown-out Reset
(BOR)
9.4.1
POWER-ON RESET (POR)
A Power-on Reset pulse is generated on-chip when
V
DD
rise is detected (in the range of 1.6 V – 1.8 V). To
take advantage of the POR, just tie the MCLR pin
directly (or through a resistor) to V
DD
. This will eliminate
external RC components usually needed to create
Power-on Reset. A maximum rise time for V
DD
is
required. See Electrical Specifications for details.
The POR circuit does not produce internal reset when
V
DD
declines.
When the device starts normal operation (exits the
reset condition), device operating parameters (voltage,
frequency, temperature, etc.) 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”.
9.4.2
POWER-UP TIMER (PWRT)
The Power-up Timer provides a fixed 72 ms (nominal)
time-out on power-up only, from POR or Brown-out
Reset. The Power-up Timer operates on an internal RC
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 enable (if cleared or programmed) the
Power-up Timer. The Power-up Timer should always be
enabled when Brown-out Reset is enabled.
The Power-Up Time delay will vary from chip to chip
and due to V
DD
, temperature and process variation.
See DC parameters for details.
9.4.3
OSCILLATOR START-UP TIMER (OST)
The Oscillator Start-Up Timer (OST) provides a 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over. This ensures that the crystal
oscillator or resonator has started and stabilized.
The OST time-out is invoked only for XT, LP and HS
modes and only on power-on reset or wake-up from
SLEEP.
9.4.4
BROWN-OUT RESET (BOR)
The PIC16C62X(A) members have on-chip Brown-out
Reset circuitry. A configuration bit, BODEN, can dis-
able (if clear/programmed) or enable (if set) the
Brown-out Reset circuitry. If V
DD
falls below 4.0V refer
to V
BOR
parameter D005(V
BOR
) for greater than
parameter (TBOR) in Table 12-6, the brown-out situa-
tion will reset the chip. A reset is not guaranteed to
occur if V
DD
falls below 4.0V for less than parameter
(TBOR). The chip will remain in Brown-out Reset until
V
DD
rises above BV
DD
. The Power-up Timer will now be
invoked and will keep the chip in reset an additional
72 ms. If V
DD
drops below BV
DD
while the Power-up
Timer is running, the chip will go back into a Brown-out
Reset and the Power-up Timer will be initialized. Once
V
DD
rises above BV
DD
, the Power-Up Timer will exe-
cute a 72 ms reset. The Power-up Timer should always
be enabled when Brown-out Reset is enabled.
Figure 9-8 shows typical Brown-out situations.
FIGURE 9-8:
BROWN-OUT SITUATIONS
72 ms
BV
DD
Max.
BV
DD
Min.
V
DD
Internal
Reset
BV
DD
Max.
BV
DD
Min.
V
DD
Internal
Reset
72 ms
<72 ms
72 ms
BV
DD
Max.
BV
DD
Min.
V
DD
Internal
Reset
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| pic16c621a | EPROM-Based 8-Bit CMOS Microcontroller(8位CMOS微控制器) |
| PIC16C622 | EPROM-Based 8-Bit CMOS Microcontroller(每個I/O口有25mA驅(qū)動/吸收電流,可編程VREF,2.5V的微控制器) |
| pic16c622a | EPROM-Based 8-Bit CMOS Microcontroller(8位CMOS微控制器) |
| PIC16C62B | 28-Pin 8-Bit CMOS Microcontrollers(28引腳，8位CMOS微控制器) |
| PIC16C63A | 8-Bit CMOS Microcontrollers with A/D Converter(8位、帶A/D轉(zhuǎn)換器的CMOS微控制器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC16C621/JW | 功能描述:8位微控制器 -MCU 1.75KB 80 RAM 13 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| PIC16C621-04/P | 功能描述:8位微控制器 -MCU 1.75KB 80 RAM 13 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| PIC16C621-04/P | 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C621 DIP18 |
| PIC16C621-04/SO | 功能描述:8位微控制器 -MCU 1.75KB 80 RAM 13 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
| PIC16C621-04/SS | 功能描述:8位微控制器 -MCU 1.75KB 80 RAM 13 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。