參數資料
型號: ATMEGA1284-AUR
廠商: Atmel
文件頁數: 115/160頁
文件大?。?/td> 0K
描述: IC MCU AVR 128K FLASH 44TQFP
產品培訓模塊: megaAVR Introduction
標準包裝: 1
系列: AVR® ATmega
核心處理器: AVR
芯體尺寸: 8-位
速度: 20MHz
連通性: I²C,SPI,UART/USART
外圍設備: 欠壓檢測/復位,POR,PWM,WDT
輸入/輸出數: 32
程序存儲器容量: 128KB(64K x 16)
程序存儲器類型: 閃存
EEPROM 大小: 4K x 8
RAM 容量: 16K x 8
電壓 - 電源 (Vcc/Vdd): 1.8 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: 44-TQFP
包裝: 剪切帶 (CT)
58
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
11.4
Register description
11.4.1
MCUSR – MCU Status Register
The MCU Status Register provides information on which reset source caused an MCU reset.
Bit 4 – JTRF: JTAG Reset Flag
This bit is set if a reset is being caused by a logic one in the JTAG Reset Register selected by
the JTAG instruction AVR_RESET. This bit is reset by a Power-on Reset, or by writing a logic
zero to the flag.
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 MCUSR 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.
Bit
7
65
43
21
0
JTRF
WDRF
BORF
EXTRF
PORF
MCUSR
Read/Write
R
R/W
Initial Value
0
See Bit Description
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