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參數(shù)資料
| 型號： | DS80C320-QNL |
| 英文描述： | High-Speed/Low-Power Micro |
| 中文描述： | High-Speed/Low-Power微 |
| 文件頁數(shù)： | 14/42頁 |
| 文件大?。?/td> | 1501K |
| 代理商： | DS80C320-QNL |
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DS80C320/DS80C323
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Timer 2. CKCON.4 selects Timer 1 and CKCON.3 selects Timer 0. Note that unless a user desires very
fast timing, it is unnecessary to alter these bits. Note that the timer controls are independent.
POWER-FAIL RESET
The DS80C320/DS80C323 incorporates a precision band-gap voltage reference to determine when V
CC
is
out of tolerance. While powering up, internal circuits will hold the device in a reset state until V
CC
rises
above the V
RST
reset threshold. Once V
CC
is above this level, the oscillator will begin running. An internal
reset circuit will then count 65536 clocks to allow time for power and the oscillator to stabilize. The
microcontroller will then exit the reset condition. No external components are needed to generate a power
on reset. During power-down or during a severe power glitch, as V
CC
falls below V
RST
, the
microcontroller will also generate its own reset. It will hold the reset condition as long as power remains
below the threshold. This reset will occur automatically, needing no action from the user or from the
software. Refer to the Electrical Specifications for the exact value of V
RST
.
POWER-FAIL INTERRUPT
The same reference that generates a precision reset threshold can also generate an optional early warning
Power-fail Interrupt (PFI). When enabled by the application software, this interrupt always has the
highest priority. On detecting that the V
CC
has dropped below V
PFW
and that the PFI is enabled, the
processor will vector to ROM address 0033h. The PFI enable is located in the Watchdog Control SFR
(WDCON - D8h). Setting WDCON.5 to a logic 1 will enable the PFI. The application software can also
read a flag at WDCON.4. This bit is set when a PFI condition has occurred. The flag is independent of
the interrupt enable and software must manually clear it.
WATCHDOG TIMER
For applications that can not afford to run out of control, the DS80C320/DS80C323 incorporates a
programmable watchdog timer circuit. It resets the microcontroller if software fails to reset the watchdog
before the selected time interval has elapsed. The user selects one of four timeout values. After enabling
the watchdog, software must reset the timer prior to expiration of the interval, or the CPU will be reset.
Both the Watchdog Enable and the Watchdog Reset bits are protected by a “Timed Access” circuit. This
prevents accidentally clearing the watchdog. Timeout values are precise since they are related to the
crystal frequency as shown below in Table 4. For reference, the time periods at 25 MHz are also shown.
The watchdog timer also provides a useful option for systems that may not require a reset. If enabled,
then 512 clocks before giving a reset, the watchdog will give an interrupt. The interrupt can also serve as
a convenient time-base generator, or be used to wake-up the processor from Idle mode. The watchdog
function is controlled in the Clock Control (CKCON - 8Eh), Watchdog Control (WDCON - D8h), and
Extended Interrupt Enable (EIE - E8h) SFRs. CKCON.7 and CKCON.6 are called WD1 and WD0
respectively and are used to select the watchdog timeout period as shown in Table 4.
WATCHDOG TIMEOUT VALUES
Table 4
INTERRUPT
TIME
RESET
WD1
WD0
TIMEOUT
(@25 MHz)
TIMEOUT
0
0
2
17
clocks
5.243 ms
2
17
+ 512 clocks
0
1
2
20
clocks
41.94 ms
2
20
+ 512 clocks
1
0
2
23
clocks
335.54 ms
2
23
+ 512 clocks
1
1
2
26
clocks
2684.35 ms
2
26
+ 512 clocks
TIME
(@25 MHz)
5.263 ms
j
41.96 ms
335.56 ms
2684.38 ms
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS80C320-MCG | High-Speed/Low-Power Micro |
| DS80C320-MCL | High-Speed/Low-Power Micro |
| DS80C320-MNG | High-Speed/Low-Power Micro |
| DS80C320-MNL | High-Speed/Low-Power Micro |
| DS80C320-QCG | High-Speed/Low-Power Micro |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS80C320-QNL/T&R | 制造商:Maxim Integrated Products 功能描述:H.S. MICRO 44PLCC 33MHZ IND T&R - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC MCU HI SPEED 33MHZ IND 44PLCC |
| DS80C320-QNL/T&R | 功能描述:8位微控制器 -MCU High-Speed Low-Power RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| DS80C320-QNL+ | 功能描述:8位微控制器 -MCU High-Speed Low-Power RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| DS80C320-QNL+T&R | 制造商:Maxim Integrated Products 功能描述:MCU 8BIT CISC ROMLESS 5V 44PLCC - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC MCU 33MHZ HS/LP 44-PLCC |
| DS80C320-QNL+T&R | 功能描述:8位微控制器 -MCU High-Speed Low-Power RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
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