参数资料
型号: R5F2L3ACCDFA
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 20 MM, 0.65 MM PITCH, PLASTIC, QFP-100
文件页数: 39/74页
文件大小: 959K
代理商: R5F2L3ACCDFA
45
2588F–AVR–06/2013
ATtiny261/461/861
The Wathdog Timer can also be configured to generate an interrupt instead of a reset. This can
be very helpful when using the Watchdog to wake-up from Power-down.
To prevent unintentional disabling of the Watchdog or unintentional change of time-out period,
two different safety levels are selected by the fuse WDTON as shown in Table 8-1 Refer to
details.
Figure 8-7.
Watchdog Timer
8.3.1
Timed Sequences for Changing the Configuration of the Watchdog Timer
The sequence for changing configuration differs slightly between the two safety levels. Separate
procedures are described for each level.
8.3.1.1
Safety Level 1
In this mode, the Watchdog Timer is initially disabled, but can be enabled by writing the WDE bit
to one without any restriction. A timed sequence is needed when disabling an enabled Watch-
dog Timer. To disable an enabled Watchdog Timer, the following procedure must be followed:
1.
In the same operation, write a logic one to WDCE and WDE. A logic one must be writ-
ten to WDE regardless of the previous value of the WDE bit.
2.
Within the next four clock cycles, in the same operation, write the WDE and WDP bits
as desired, but with the WDCE bit cleared.
8.3.1.2
Safety Level 2
In this mode, the Watchdog Timer is always enabled, and the WDE bit will always read as one. A
timed sequence is needed when changing the Watchdog Time-out period. To change the
Watchdog Time-out, the following procedure must be followed:
Table 8-1.
WDT Configuration as a Function of the Fuse Settings of WDTON
WDTON
Safety
Level
WDT Initial
State
How to Disable the
WDT
How to Change Time-
out
Unprogrammed
1
Disabled
Timed sequence
No limitations
Programmed
2
Enabled
Always enabled
Timed sequence
O
S
C/2K
O
S
C/4K
O
S
C/
8
K
O
S
C/16K
O
S
C/
3
2K
O
S
C/64K
O
S
C/12
8
K
O
S
C/256K
O
S
C/512K
O
S
C/1024K
MCU RESET
WATCHDOG
PRESCALER
128 kHz
OSCILLATOR
WATCHDOG
RESET
WDP0
WDP1
WDP2
WDP3
WDE
相关PDF资料
PDF描述
R5F2L38CCNFA 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP80
R5F2L388CNFP 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP80
R5F2L3A8CNFA 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP100
R5F2L36CCNFP 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP64
R5F2L367CDFA 8-BIT, FLASH, 20 MHz, MICROCONTROLLER, PQFP64
相关代理商/技术参数
参数描述
R5F2L3ACCDFA#U0 功能描述:MCU 128KB ROM 10KB RAM 100LQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:R8C/Lx/3AC 标准包装:250 系列:80C 核心处理器:8051 芯体尺寸:8-位 速度:16MHz 连通性:EBI/EMI,I²C,UART/USART 外围设备:POR,PWM,WDT 输入/输出数:40 程序存储器容量:- 程序存储器类型:ROMless EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-LCC(J 形引线) 包装:带卷 (TR)
R5F2L3ACCDFP#V0 功能描述:MCU 128KB ROM 10KB RAM 100-LQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:R8C/Lx/3AC 标准包装:250 系列:80C 核心处理器:8051 芯体尺寸:8-位 速度:16MHz 连通性:EBI/EMI,I²C,UART/USART 外围设备:POR,PWM,WDT 输入/输出数:40 程序存储器容量:- 程序存储器类型:ROMless EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-LCC(J 形引线) 包装:带卷 (TR)
R5F2L3ACCNFA#U0 功能描述:MCU 128KB ROM 10KB RAM 100-LQFP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器, 系列:R8C/Lx/3AC 标准包装:250 系列:80C 核心处理器:8051 芯体尺寸:8-位 速度:16MHz 连通性:EBI/EMI,I²C,UART/USART 外围设备:POR,PWM,WDT 输入/输出数:40 程序存储器容量:- 程序存储器类型:ROMless EEPROM 大小:- RAM 容量:256 x 8 电压 - 电源 (Vcc/Vdd):4.5 V ~ 5.5 V 数据转换器:A/D 8x10b 振荡器型:内部 工作温度:-40°C ~ 85°C 封装/外壳:68-LCC(J 形引线) 包装:带卷 (TR)
R5F2L3ACCNFP#30 制造商:Renesas Electronics Corporation 功能描述:IC MCU 16BIT 128KB FLASH 100LQFP
R5F2L3ACCNFP#U1 制造商:Renesas Electronics Corporation 功能描述: