參數(shù)資料
型號： ATWEBDVK-02WC
廠商： Atmel
文件頁數(shù)： 117/137頁
文件大?。?/td> 0K
描述： KIT DEV TCP/IP AT89C51RD2 WEBCAM
標準包裝： 1
系列： @Web
主要目的： *
嵌入式： *
已用 IC / 零件： AT89C51RD2
主要屬性： *
次要屬性： *
已供物品： 板，帶網(wǎng)絡 Webcam 模塊和軟件
產(chǎn)品目錄頁面： 617 (CN2011-ZH PDF)
80
4235K–8051–05/08
AT89C51RD2/ED2
18. Power Management
18.1
Introduction
Two power reduction modes are implemented in the AT89C51RD2/ED2. The Idle mode and the
Power-Down mode. These modes are detailed in the following sections. In addition to these
power reduction modes, the clocks of the core and peripherals can be dynamically divided by 2
using the X2 mode detailed in Section “Enhanced Features”, page 17.
18.2
Idle Mode
Idle mode is a power reduction mode that reduces the power consumption. In this mode, pro-
gram execution halts. Idle mode freezes the clock to the CPU at known states while the
peripherals continue to be clocked. The CPU status before entering Idle mode is preserved, i.e.,
the program counter and program status word register retain their data for the duration of Idle
mode. The contents of the SFRs and RAM are also retained. The status of the Port pins during
Idle mode is detailed in Table 18-1.
18.2.1
Entering Idle Mode
To enter Idle mode, set the IDL bit in PCON register (see Table 18-2). The AT89C51RD2/ED2
enters Idle mode upon execution of the instruction that sets IDL bit. The instruction that sets IDL
bit is the last instruction executed.
Note:
If IDL bit and PD bit are set simultaneously, the AT89C51RD2/ED2 enters Power-Down mode.
Then it does not go in Idle mode when exiting Power-Down mode.
18.2.2
Exiting Idle Mode
There are two ways to exit Idle mode:
1.
Generate an enabled interrupt.
– Hardware clears IDL bit in PCON register which restores the clock to the CPU.
Execution resumes with the interrupt service routine. Upon completion of the
interrupt service routine, program execution resumes with the instruction
immediately following the instruction that activated Idle mode. The general purpose
flags (GF1 and GF0 in PCON register) may be used to indicate whether an interrupt
occurred during normal operation or during Idle mode. When Idle mode is exited by
an interrupt, the interrupt service routine may examine GF1 and GF0.
2.
Generate a reset.
– A logic high on the RST pin clears IDL bit in PCON register directly and
asynchronously. This restores the clock to the CPU. Program execution momentarily
resumes with the instruction immediately following the instruction that activated the
Idle mode and may continue for a number of clock cycles before the internal reset
algorithm takes control. Reset initializes the AT89C51RD2/ED2 and vectors the CPU
to address C:0000h.
Note:
During the time that execution resumes, the internal RAM cannot be accessed; however, it is pos-
sible for the Port pins to be accessed. To avoid unexpected outputs at the Port pins, the instruction
immediately following the instruction that activated Idle mode should not write to a Port pin or to
the external RAM.
相關(guān)PDF資料
PDF描述
VRE210MA IC VREF SERIES PREC 10V 20-CLCC
VRE204M IC VREF SERIES PREC 4.5V 20-CLCC
ATWEBDVK-02VOIP KIT DEV TCP/IP AT89C51RD2 VOIP
A3DDB-1018G IDC CABLE- AKR10B/AE10G/AKR10B
V24C12E150BL3 CONVERTER MOD DC/DC 12V 150W
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ATWEBEVK-01 功能描述:KIT EVAL TCP/IP AT89C51AC2 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:@Web 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板
ATWEBEVK-02 功能描述:KIT SOFTWARE EVAL FOR T89C51CC01 制造商:microchip technology 系列:- 零件狀態(tài):停產(chǎn) 主要用途:接口，以太網(wǎng) 嵌入式:- 使用的 IC/零件:- 主要屬性:- 輔助屬性:- 所含物品:板 標準包裝:1
ATWEBEVK-05 功能描述:KIT EVAL MODULE RS232 TO TCP/IP RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:@Web 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板
ATWEBEVK-06 功能描述:BOARD EVAL FOR CAN-ETHERNET MOD RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:@Web 產(chǎn)品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:- 主要目的:電源管理，電池充電器 嵌入式:否 已用 IC / 零件:MAX8903A 主要屬性:1 芯鋰離子電池 次要屬性:狀態(tài) LED 已供物品:板
ATWEBSEG-32 功能描述:MODULE RS232 TO TCP/IP RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標準包裝:1 系列:- 類型:MCU 適用于相關(guān)產(chǎn)品:Freescale MC68HC908LJ/LK（80-QFP ZIF 插口） 所含物品:面板、纜線、軟件、數(shù)據(jù)表和用戶手冊 其它名稱:520-1035
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*