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| 型號(hào)： | MR80C52EXXX-20SCD |
| 廠(chǎng)商： | TEMIC SEMICONDUCTORS |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44 |
| 文件頁(yè)數(shù)： | 159/219頁(yè) |
| 文件大?。?/td> | 7896K |
| 代理商： | MR80C52EXXX-20SCD |
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42
ATmega8A [DATASHEET]
8159E–AVR–02/2013
11.6
Register Description
11.6.1
MCUCSR – MCU Control and Status Register
The MCU Control and Status Register provides information on which reset source caused an MCU Reset.
Bit 7:4 – Res: Reserved Bits
These bits are reserved bits in the ATmega8A and always read as zero.
Bit 3 – WDRF: Watchdog Reset Flag
This bit is set if a Watchdog Reset occurs. The bit is reset by a Power-on Reset, or by writing a logic zero to the
flag.
Bit 2 – BORF: Brown-out Reset Flag
This bit is set if a Brown-out Reset occurs. The bit is reset by a Power-on Reset, or by writing a logic zero to the
flag.
Bit 1 – EXTRF: External Reset Flag
This bit is set if an External Reset occurs. The bit is reset by a Power-on Reset, or by writing a logic zero to the flag.
Bit 0 – PORF: Power-on Reset Flag
This bit is set if a Power-on Reset occurs. The bit is reset only by writing a logic zero to the flag.
To make use of the Reset Flags to identify a reset condition, the user should read and then reset the MCUCSR as
early as possible in the program. If the register is cleared before another reset occurs, the source of the reset can
be found by examining the Reset Flags.
11.6.2
WDTCR – Watchdog Timer Control Register
Bits 7:5 – Res: Reserved Bits
These bits are reserved bits in the ATmega8A and will always read as zero.
Bit 4 – WDCE: Watchdog Change Enable
This bit must be set when the WDE bit is written to logic zero. Otherwise, the Watchdog will not be disabled. Once
written to one, hardware will clear this bit after four clock cycles. Refer to the description of the WDE bit for a
Watchdog disable procedure. In Safety Level 1 and 2, this bit must also be set when changing the prescaler bits.
See the Code Examples on page 40.
Bit 3 – WDE: Watchdog Enable
When the WDE is written to logic one, the Watchdog Timer is enabled, and if the WDE is written to logic zero, the
Watchdog Timer function is disabled. WDE can only be cleared if the WDCE bit has logic level one. To disable an
enabled Watchdog Timer, the following procedure must be followed:
Bit
7
654
32
10
–
WDRF
BORF
EXTRF
PORF
MCUCSR
Read/Write
R
R/W
Initial Value
0
See Bit Description
Bit
7654
3210
–
WDCE
WDE
WDP2
WDP1
WDP0
WDTCR
Read/Write
R
R/W
Initial Value
0000
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MR80C32-16SHXXX | 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44 |
| MD80C32EXXX-30/883 | 8-BIT, 30 MHz, MICROCONTROLLER, CDIP40 |
| MR80C32E-16SC | 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44 |
| MQ80C52EXXX-20/883D | 8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44 |
| MR80C32E-16SHXXX:R | 8-BIT, 16 MHz, MICROCONTROLLER, CQCC44 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MR80C86 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MR80C86/B | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Harris Corporation 功能描述:Microprocessor, 16 Bit, 44 Pin, Ceramic, LCC |
| MR80C86-2 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:CMOS 16-Bit Microprocessor |
| MR80C86-2/883 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MR80C86-2/B | 制造商:Intersil Corporation 功能描述:MPU 80C86 16BIT CMOS 8MHZ 44PLCC - Rail/Tube |
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