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參數(shù)資料
| 型號： | pic16ce623 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | OTP 8-Bit CMOS MCU with EEPROM Data Memory(8位OTP CMOS微控制器) |
| 中文描述： | 檢察官辦公室8位CMOS微控制器EEPROM數(shù)據(jù)存儲器（8位檢察官辦公室的CMOS微控制器） |
| 文件頁數(shù)： | 54/108頁 |
| 文件大?。?/td> | 2355K |
| 代理商： | PIC16CE623 |
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PIC16CE62X
DS40182A-page 54
Preliminary
1998 Microchip Technology Inc.
10.4
Power-on Reset (POR), Power-up
Timer (PWRT), Oscillator Start-up
Timer (OST) and Brown-out Reset
(BOR)
10.4.1
POWER-ON RESET (POR)
The on-chip POR circuit holds the chip in reset until
V
DD
has reached a high enough level for proper opera-
tion. 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”.
10.4.2
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.
10.4.3
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.
10.4.4
BROWN-OUT RESET (BOR)
The PIC16CE62X 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
BV
DD
parameter D005) for greater than parameter
(TBOR) in Table 13-6, the brown-out situation 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 execute a 72 ms
reset. The Power-up Timer should always be enabled
when Brown-out Reset is enabled. Figure 10-8 shows
typical Brown-out situations.
FIGURE 10-8: BROWN-OUT SITUATIONS
72 ms
BV
DD
V
DD
Internal
Reset
BV
DD
V
DD
Internal
Reset
72 ms
<72 ms
72 ms
BV
DD
V
DD
Internal
Reset
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC16CE623/JW | 功能描述:8位微控制器 -MCU .875KB 96 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 |
| PIC16CE623-04/P | 功能描述:8位微控制器 -MCU .875KB 96 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 |
| PIC16CE623-04/SO | 功能描述:8位微控制器 -MCU .875KB 96 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 |
| PIC16CE623-04/SS | 功能描述:8位微控制器 -MCU .875KB 96 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 |
| PIC16CE623-04E/P | 功能描述:8位微控制器 -MCU .875KB 96 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 |
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