- 您現在的位置：買賣IC網 > PDF目錄363895 > W77E058A40FL (WINBOND ELECTRONICS CORP) 8-BIT MICROCONTROLLER PDF資料下載
參數資料
| 型號： | W77E058A40FL |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP44 |
| 封裝： | ROHS COMPLIANT, PLASTIC, QFP-44 |
| 文件頁數： | 44/87頁 |
| 文件大?。?/td> | 594K |
| 代理商： | W77E058A40FL |
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頁當前第44頁第45頁第46頁第47頁第48頁第49頁第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
W77E058A
- 44 -
9. POWER MANAGEMENT
The W77E058 has several features that help the user to control the power consumption of the device.
The power saving features are basically the POWER DOWN mode, ECONOMY mode and the IDLE
mode of operation.
9.1 Idle Mode
The user can put the device into idle mode by writing 1 to the bit PCON.0. The instruction that sets the
idle bit is the last instruction that will be executed before the device goes into Idle Mode. In the Idle
mode, the clock to the CPU is halted, but not to the Interrupt, Timer, Watchdog timer and Serial port
blocks. This forces the CPU state to be frozen; the Program counter, the Stack Pointer, the Program
Status Word, the Accumulator and the other registers hold their contents. The ALE and PSEN pins are
held high during the Idle state. The port pins hold the logical states they had at the time Idle was
activated. The Idle mode can be terminated in two ways. Since the interrupt controller is still active, the
activation of any enabled interrupt can wake up the processor. This will automatically clear the Idle bit,
terminate the Idle mode, and the Interrupt Service Routine(ISR) will be executed. After the ISR,
execution of the program will continue from the instruction which put the device into Idle mode.
The Idle mode can also be exited by activating the reset. The device can be put into reset either by
applying a high on the external RST pin, a Power on reset condition or a Watchdog timer reset. The
external reset pin has to be held high for at least two machine cycles i.e. 8 clock periods to be
recognized as a valid reset. In the reset condition the program counter is reset to 0000h and all the
SFRs are set to the reset condition. Since the clock is already running there is no delay and execution
starts immediately. In the Idle mode, the Watchdog timer continues to run, and if enabled, a time-out
will cause a watchdog timer interrupt which will wake up the device. The software must reset the
Watchdog timer in order to preempt the reset which will occur after 512 clock periods of the time-out.
When the W77E058 is exiting from an Idle mode with a reset, the instruction following the one which
put the device into Idle mode is not executed. So there is no danger of unexpected writes.
9.2 Economy Mode
The power consumption of microcontroller relates to operating frequency. The W77E058 offers a
Economy mode to reduce the internal clock rate dynamically without external components. By default,
one machine cycle needs 4 clocks. In Economy mode, software can select 4, 64 or 1024 clocks per
machine cycle. It keeps the CPU operating at a acceptable speed but eliminates the power
consumption. In the Idle mode, the clock of the core logic is stopped, but all clocked peripherals such
as watchdog timer are still running at a rate of clock/4. In the Economy mode, all clocked peripherals
run at the same reduced clocks rate as in core logic. So the Economy mode may provide a lower
power consumption than idle mode.
Software invokes the Economy mode by setting the appropriate bits in the SFRs. Setting the bits
CD0(PMR.6), CD1(PMR.7) decides the instruction cycle rate as below:
CD1 CD0 Clocks/Machine Cycle
0 0 Reserved
0 1 4 (default)
1 0 64
1 1 1024
相關PDF資料 |
PDF描述 |
|---|---|
| W77E058A40PL | 8-BIT MICROCONTROLLER |
| W77E058A | 8-BIT MICROCONTROLLER |
| W77E468F-25 | 8 BIT MICROCONTROLLER |
| W77E468F-40 | 8 BIT MICROCONTROLLER |
| W77E468 | 8 BIT MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W77E058A40PL | 功能描述:IC MCU 8-BIT 32K FLASH 44-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W77 標準包裝:250 系列:56F8xxx 核心處理器:56800E 芯體尺寸:16-位 速度:60MHz 連通性:CAN，SCI，SPI 外圍設備:POR，PWM，溫度傳感器，WDT 輸入/輸出數:21 程序存儲器容量:40KB（20K x 16） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:6K x 16 電壓 - 電源 (Vcc/Vdd):2.25 V ~ 3.6 V 數據轉換器:A/D 6x12b 振蕩器型:內部 工作溫度:-40°C ~ 125°C 封裝/外殼:48-LQFP 包裝:托盤 配用:MC56F8323EVME-ND - BOARD EVALUATION MC56F8323 |
| W77E11 | 制造商:OMRON INDUSTRIAL AUTOMATION 功能描述:EXECUTION EX. NO.1 DX CODE ZA |
| W77E468 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77E468F-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
| W77E468F-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8 BIT MICROCONTROLLER |
發(fā)布緊急采購，3分鐘左右您將得到回復。