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參數(shù)資料
| 型號： | W78ERD2A40FL |
| 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(shù)： | 50/76頁 |
| 文件大?。?/td> | 650K |
| 代理商： | W78ERD2A40FL |
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W78ERD2/W78ERD2A
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12. HARDWARE WATCHDOG TIMER (ONE-TIME ENABLED WITH RESET-OUT)
The WDT is intended as a way to recover when the CPU may be subject to software problem. The
WDT consists of a 14-bit counter and the WDT reset (WDTRST) register located at 0A6H. The WDT is
disabled at reset. To enable the WDT, user must write 01EH and 0E1H in sequence to WDTRST.
Once the WDT is enabled, it increments every machine cycle, while the oscillator is running, and
there is no way to disable the WDT except through reset
(either hardware reset or WDT overflow
reset). The program must reset the counter by writing 01EH and 0E1H to WDTRST before the WDT
counter reaches 3FFFH (i.e., overflows). If it does overflow, it drives a HIGH pulse on the RST-pin.
This pulse width is 98 source clocks in 12-clock mode or 49 source clocks in 6-clock mode. No
external pull-down resistor or pull-up capacitor is required on the reset pin.
The WDT counter cannot be read or written. To make the best use of the WDT, the WDT should be
reset in sections of code that are periodically executed in time to prevent a WDT reset.
13. DUAL DPTR
The dual DPTR structure is the way the chip specifies the address of an external data memory
location. There are two 16-bit DPTR registers that address external memory. The DPS bit (AUXR1, bit
0) switches between them, and it can be toggled quickly by an INC AUXR1 instruction. (AUXR1, bit 2
cannot be written and is always read as a zero, so the INC AUXR1 instruction does not affect the GF2
bit that is higher in the AUXR1 register.)
It is important to keep track of the value of the DPS bit. For example, procedures and functions should
save the DPS bit before switching between DPTR0 and DPTR1 and restore the original value
afterwards to prevent other code from using the wrong memory.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| W78ERD2A40PL | 8-BIT MICROCONTROLLER |
| W78ERD2 | 8-BIT MICROCONTROLLER |
| W78ERD2A40DN | 8-BIT MICROCONTROLLER |
| W78ERD2A40FN | 8-BIT MICROCONTROLLER |
| W78ERD2A40PN | 8-BIT MICROCONTROLLER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| W78ERD2A40FN | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78ERD2A40PL | 功能描述:IC MCU 8-BIT 64K FLASH 44-PLCC RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:W78 標準包裝:300 系列:78K0R/Ix3 核心處理器:78K/0R 芯體尺寸:16-位 速度:40MHz 連通性:3 線 SIO，I²C，LIN，UART/USART 外圍設(shè)備:DMA，LVD，POR，PWM，WDT 輸入/輸出數(shù):27 程序存儲器容量:16KB（16K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:38-SSOP 包裝:托盤 |
| W78ERD2A40PN | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78I052A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
| W78I052A24DL | 制造商:WINBOND 制造商全稱:Winbond 功能描述:8-BIT MICROCONTROLLER |
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