參數(shù)資料
型號(hào): AT90USB647-MU
廠商: Atmel
文件頁(yè)數(shù): 69/106頁(yè)
文件大小: 0K
描述: IC AVR MCU 64K 64QFN
產(chǎn)品培訓(xùn)模塊: megaAVR Introduction
標(biāo)準(zhǔn)包裝: 1,300
系列: AVR®
應(yīng)用: USB 微控制器
核心處理器: AVR
程序存儲(chǔ)器類型: 閃存(64 kB)
控制器系列: AT90 USB
RAM 容量: 4K x 8
接口: 2 線串行,SPI 串行,USART,USB
輸入/輸出數(shù): 48
電源電壓: 2.7 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤
包裝: 托盤
供應(yīng)商設(shè)備封裝: 64-VQFN(9x9)
配用: ATSTK600-TQFP64-ND - STK600 SOCKET/ADAPTER 64-TQFP
ATSTK525-ND - KIT STARTER FOR AT90USB
AT90USBKEY2-ND - KIT DEMO FOR AT90USB
其它名稱: AT90USB647-16MU
AT90USB647-16MU-ND
Q4939729A
65
7593L–AVR–09/12
AT90USB64/128
Note: If the Watchdog is accidentally enabled, for example by a runaway pointer or brown-out
condition, the device will be reset and the Watchdog Timer will stay enabled. If the code is not
set up to handle the Watchdog, this might lead to an eternal loop of time-out resets. To avoid this
situation, the application software should always clear the Watchdog System Reset Flag
(WDRF) and the WDE control bit in the initialization routine, even if the Watchdog is not in use.
The following code example shows one assembly and one C function for changing the time-out
value of the Watchdog Timer.
Note:
1. The example code assumes that the part specific header file is included.
Note: The Watchdog Timer should be reset before any change of the WDP bits, since a change
in the WDP bits can result in a time-out when switching to a shorter time-out period.
9.8.1
WDTCSR – Watchdog Timer Control Register
Assembly code example
WDT_Prescaler_Change:
; Turn off global interrupt
cli
; Reset Watchdog Timer
wdr
; Start timed sequence
in
r16, WDTCSR
ori
r16, (1<<WDCE) | (1<<WDE)
out
WDTCSR, r16
; --
Got four cycles to set the new values from here -
; Set new prescaler(time-out) value = 64K cycles (~0.5 s)
ldi
r16, (1<<WDE) | (1<<WDP2) | (1<<WDP0)
out
WDTCSR, r16
; --
Finished setting new values, used 2 cycles -
; Turn on global interrupt
sei
ret
C code example (1)
void WDT_Prescaler_Change(void)
{
__disable_interrupt();
__watchdog_reset();
/* Start timed
equence */
WDTCSR |= (1<<WDCE) | (1<<WDE);
/* Set new prescaler(time-out) value = 64K cycles (~0.5 s) */
WDTCSR
= (1<<WDE) | (1<<WDP2) | (1<<WDP0);
__enable_interrupt();
}
Bit
7654
32
10
WDIF
WDIE
WDP3
WDCE
WDE
WDP2
WDP1
WDP0
WDTCSR
Read/write
R/W
Initial value
0000
X
0
00
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