參數(shù)資料
型號(hào)： AT89S2051-24PU
廠商： ATMEL CORP
元件分類： 微控制器/微處理器
英文描述： 8-bit Microcontroller with 2K/4K Bytes Flash
中文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDIP20
封裝： 0.300 INCH, GREEN, MS-001AD, PLASTIC, DIP-20
文件頁數(shù)： 46/46頁
文件大小： 1106K
代理商： AT89S2051-24PU
9
3390E–MICRO–6/08
AT89S2051/S4051
10.2
Brown-out Reset
The AT89S2051/S4051 has an on-chip Brown-out Detection (BOD) circuit for monitoring the V
CC
level during operation by comparing it to a fixed trigger level. The trigger level for the BOD is
nominally 2.0V. The purpose of the BOD is to ensure that if V
CC fails or dips while executing at
speed, the system will gracefully enter reset without the possibility of errors induced by incorrect
execution. When V
CC decreases to a value below the trigger level, the Brown-out Reset is imme-
diately activated. When V
CC increases above the trigger level, the BOD delay counter starts the
microcontroller after the timeout period has expired in approximately 2 ms.
10.3
External Reset
The RST pin functions as an active-high reset input. The pin must be held high for at least two
machine cycles to trigger the internal reset. RST also serves as the In-System Programming
(ISP) enable input. ISP mode is enabled when the external reset pin is held high and the ISP
Enable fuse is set.
11. Clock Register
.
Table 11-1.
CLKREG
– Clock Register
CLKREG = 8FH
Reset Value = XXXX XX0XB
Not Bit Addressable
––
–––
–
PWDEX
X2
Bit
7
6
543
21
0
Symbol
Function
PWDEX
Power-down Exit Mode. When PWDEX = 1, wake up from Power-down is externally controlled. When PWDEX = 0, wake
up from Power-down is internally timed.
X2
When X2 = 0, the frequency (at XTAL1 pin) is internally divided by 2 before it is used as the device system frequency.
When X2 = 1, the divide by 2 is no longer used and the XTAL1 frequency becomes the device system frequency. This
enables the user to use a 6 MHz crystal instead of a 12 MHz crystal in order to reduce EMI. The X2 bit is initialized on
power-up with the value of the X2 user fuse and may be changed at runtime by software.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT89S2051-24SU 功能描述:8位微控制器 -MCU 2K FLASH 24MHZ SOIC 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
AT89S2051W-16PI 功能描述:8位微控制器 -MCU Microcontroller 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
AT89S2051W-16SI 功能描述:8位微控制器 -MCU Microcontroller 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
AT89S4051-24PU 功能描述:8位微控制器 -MCU 4K FLASH 24MHZ 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
AT89S4051-24SU 功能描述:8位微控制器 -MCU 4K FLASH 24MHZ 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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