參數(shù)資料
型號(hào)： AT87C51RB2-SLSUL
廠商： Atmel
文件頁(yè)數(shù)： 80/84頁(yè)
文件大?。?/td> 0K
描述： IC 8051 MCU 16K OTP 30MHZ 44PLCC
標(biāo)準(zhǔn)包裝： 972
系列： 87C
核心處理器： 8051
芯體尺寸： 8-位
速度： 30/20MHz
連通性： UART/USART
外圍設(shè)備： POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 16KB（16K x 8）
程序存儲(chǔ)器類型： OTP
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 44-LCC（J 形引線）
包裝： 管件
2007-2012 Microchip Technology Inc.
DS70292G-page 83
dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04
6.4
Power-on Reset (POR)
A Power-on Reset (POR) circuit ensures the device is
reset from power-on. The POR circuit is active until
VDD crosses the VPOR threshold and the delay TPOR
has elapsed. The delay TPOR ensures the internal
device bias circuits become stable.
The device supply voltage characteristics must meet
the
specified
starting
voltage
and
rise
rate
requirements to generate the POR. Refer to
The POR status bit (POR) in the Reset Control register
(RCON<0>) is set to indicate the Power-on Reset.
6.4.1
Brown-out Reset (BOR) and
Power-up timer (PWRT)
The on-chip regulator has a Brown-out Reset (BOR)
circuit that resets the device when the VDD is too low
(VDD < VBOR) for proper device operation. The BOR cir-
cuit keeps the device in Reset until VDD crosses VBOR
threshold and the delay TBOR has elapsed. The delay
TBOR ensures the voltage regulator output becomes
stable.
The BOR status bit (BOR) in the Reset Control register
(RCON<1>) is set to indicate the Brown-out Reset.
The device will not run at full speed after a BOR as the
VDD should rise to acceptable levels for full-speed
operation. The PWRT provides power-up time delay
(TPWRT) to ensure that the system power supplies have
stabilized at the appropriate levels for full-speed
operation before the SYSRST is released.
The power-up timer delay (TPWRT) is programmed by
the Power-on Reset Timer Value Select bits
(FPWRT<2:0>) in the POR Configuration register
(FPOR<2:0>), which provides eight settings (from 0 ms
for further details.
Figure 6-3 shows the typical brown-out scenarios. The
reset delay (TBOR + TPWRT) is initiated each time VDD
rises above the VBOR trip point
TABLE 6-2:
OSCILLATOR DELAY
Symbol
Parameter
Value
VPOR
POR threshold
1.8V nominal
TPOR
POR extension time
30
μs maximum
VBOR
BOR threshold
2.5V nominal
TBOR
BOR extension time
100
μs maximum
TPWRT
Programmable power-up time delay
0-128 ms nominal
TFSCM
Fail-Safe Clock Monitor Delay
900
μs maximum
Note:
When the device exits the Reset condi-
tion (begins normal operation), the
device operating parameters (voltage,
frequency, temperature, etc.) must be
within their operating ranges, otherwise
the device may not function correctly.
The user application must ensure that
the delay between the time power is
first applied, and the time SYSRST
becomes inactive, is long enough to get
all
operating
parameters
within
specification.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT87C51RB2-SLSUM 功能描述:8位微控制器 -MCU OTP RB/16K 40MHZ 3V 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
AT87C51RC2 制造商:IRF 制造商全稱:International Rectifier 功能描述:High Performance 8-bit Microcontroller
AT87C51RC2-3CSUL 功能描述:8位微控制器 -MCU OTP RC/32K 40MHZ 3V 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
AT87C51RC2-3CSUM 功能描述:8位微控制器 -MCU 32KB SCMOS 3/2 .5 OTP 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
AT87C51RC2-RLTUL 功能描述:8位微控制器 -MCU OTP RC/32K 40MHZ 3V 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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