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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： | 51/85頁 |
| 文件大?。?/td> | 596K |
| 代理商： | W77E516 |
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Preliminary W77E516
Publication Release Date: August 16, 2002
- 51 -
Revision A1
level on the external pin re-starts the oscillator. Then device executes the interrupt service routine
for the corresponding external interrupt. After the interrupt service routine is completed, the
program execution returns to the instruction after the one which put the device into Power Down
mode and continues from there. When RGSL(EXIF.1) bit is set to 1, the CPU will use the internal
RC oscillator instead of crystal to exit Power Down mode. The microcontroller will automatically
switch from RC oscillator to crystal after clock is stable. The RC oscillator runs at approximately 2
4 MHz. Using RC oscillator to exit from Power Down mode saves the time for waiting crystal start-
up. It is useful in the low power system which usually be awakened from a short operation then
returns to Power Down mode.
Table 5. Status of external pins during Idle and Power Down
MODE
PROGRAM
MEMORY
ALE
PSEN
PORT0
PORT1
PORT2
PORT3
Idle
Internal
1
1
Data
Data
Data
Data
Idle
External
1
1
Float
Data
Address
Data
Power Down
Internal
0
0
Data
Data
Data
Data
Power Down
External
0
0
Float
Data
Data
Data
Reset Conditions
The user has several hardware related options for placing the W77E516 into reset condition. In
general, most register bits go to their reset value irrespective of the reset condition, but there are a few
flags whose state depends on the source of reset. The user can use these flags to determine the
cause of reset using software. There are three ways of putting the device into reset state. They are
External reset, Power on reset and Watchdog reset.
External Reset
The device continuously samples the RST pin at state C4 of every machine cycle. Therefore the
RST pin must be held for at least 2 machine cycles to ensure detection of a valid RST high. The
reset circuitry then synchronously applies the internal reset signal. Thus the reset is a synchronous
operation and requires the clock to be running to cause an external reset.
Once the device is in reset condition, it will remain so as long as RST is 1. Even after RST is
deactivated, the device will continue to be in reset state for up to two machine cycles, and then
begin program execution from 0000h. There is no flag associated with the external reset condition.
However since the other two reset sources have flags, the external reset can be considered as the
default reset if those two flags are cleared.
Watchdog Timer Reset
The Watchdog timer is a free running timer with programmable time-out intervals. The user can
clear the watchdog timer at any time, causing it to restart the count. When the time-out interval is
reached an interrupt flag is set. If the Watchdog reset is enabled and the watchdog timer is not
cleared, then 512 clocks from the flag being set, the watchdog timer will generate a reset. This
places the device into the reset condition. The reset condition is maintained by hardware for two
machine cycles. Once the reset is removed the device will begin execution from 0000h.
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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