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參數資料
| 型號： | W77E516 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數： | 49/85頁 |
| 文件大小： | 596K |
| 代理商： | W77E516 |
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Preliminary W77E516
Publication Release Date: August 16, 2002
- 49 -
Revision A1
Power Management
The W77E516 has several features that help the user to modify the power consumption of the device.
The power saving features are basically the POWER DOWN mode, ECONOMY mode and the IDLE
mode of operation.
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/fail 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 W77E516 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.
Economy Mode
The power consumption of microcontroller relates to operating frequency. The W77E516 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 |
|---|---|
| W77E516-25 | 8-BIT MICROCONTROLLER |
| W77E516-40 | 8-BIT MICROCONTROLLER |
| W77E516F-25 | 8-BIT MICROCONTROLLER |
| W77E516F-40 | 8-BIT MICROCONTROLLER |
| W77E516P-25 | 8-BIT MICROCONTROLLER |
相關代理商/技術參數 |
參數描述 |
|---|---|
| W77E516-25 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516-40 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W77E516A40DL | 功能描述:IC MCU 8-BIT 64K FLASH 40-DIP 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:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設備:POR，PWM，WDT 輸入/輸出數:40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數據轉換器:A/D 8x10b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
| W77E516A40FL | 功能描述:IC MCU 8-BIT 64K FLASH 44-QFP 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:80C 核心處理器:8051 芯體尺寸:8-位 速度:16MHz 連通性:EBI/EMI，I²C，UART/USART 外圍設備:POR，PWM，WDT 輸入/輸出數:40 程序存儲器容量:- 程序存儲器類型:ROMless EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數據轉換器:A/D 8x10b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:68-LCC（J 形引線） 包裝:帶卷 (TR) |
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