参数资料
型号: DSPIC33FJ12MC201T-I/SS
厂商: Microchip Technology
文件页数: 127/155页
文件大小: 0K
描述: IC DSPIC MCU/DSP 12K 20SSOP
产品培训模块: Asynchronous Stimulus
标准包装: 1,600
系列: dsPIC™ 33F
核心处理器: dsPIC
芯体尺寸: 16-位
速度: 40 MIP
连通性: I²C,IrDA,SPI,UART/USART
外围设备: 高级欠压探测/复位,电机控制 PWM,QEI,POR,PWM,WDT
输入/输出数: 15
程序存储器容量: 12KB(12K x 8)
程序存储器类型: 闪存
RAM 容量: 1K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 4x10b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 20-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
配用: DV164033-ND - KIT START EXPLORER 16 MPLAB ICD2
DM240001-ND - BOARD DEMO PIC24/DSPIC33/PIC32
其它名称: DSPIC33FJ12MC201T-I/SSTR
73
A/T89C51AC2
4127H–8051–02/08
Watchdog Timer During
Power-down Mode and
Idle
In Power-down mode the oscillator stops, which means the WDT also stops. While in
Power-down mode, the user does not need to service the WDT. There are 2 methods of
exiting Power-down mode: by a hardware reset or via a level activated external interrupt
which is enabled prior to entering Power-down mode. When Power-down is exited with
hardware reset, the Watchdog is disabled. Exiting Power-down with an interrupt is sig-
nificantly different. The interrupt shall be held low long enough for the oscillator to
stabilize. When the interrupt is brought high, the interrupt is serviced. To prevent the
WDT from resetting the device while the interrupt pin is held low, the WDT is not started
until the interrupt is pulled high. It is suggested that the WDT be reset during the inter-
rupt service for the interrupt used to exit Power-down.
To ensure that the WDT does not overflow within a few states of exiting powerdown, it is
best to reset the WDT just before entering powerdown.
In the Idle mode, the oscillator continues to run. To prevent the WDT from resetting
A/T89C51AC2 while in Idle mode, the user should always set up a timer that will period-
ically exit Idle, service the WDT, and re-enter Idle mode.
Register
Table 53. WDTPRG Register
WDTPRG (S:A7h)
Watchdog Timer Duration Programming Register
Reset Value = XXXX X000b
7
6
5
4
3
2
1
0
S2
S1
S0
Bit
Number
Bit
Mnemonic Description
7
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
4
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
3
-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
2
S2
Watchdog Timer Duration selection bit 2
Work in conjunction with bit 1 and bit 0.
1
S1
Watchdog Timer Duration selection bit 1
Work in conjunction with bit 2 and bit 0.
0
S0
Watchdog Timer Duration selection bit 0
Work in conjunction with bit 1 and bit 2.
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