參數(shù)資料
型號(hào)： COP8CCR9LVA8
廠商： National Semiconductor
文件頁數(shù)： 33/111頁
文件大?。?/td> 0K
描述： IC MCU EEPROM 8BIT 68-PLCC
標(biāo)準(zhǔn)包裝： 18
系列： COP8™ 8C
核心處理器： COP8
芯體尺寸： 8-位
速度： 20MHz
連通性： Microwire/Plus（SPI），UART/USART
外圍設(shè)備： 欠壓檢測(cè)/復(fù)位，POR，PWM，WDT
輸入/輸出數(shù)： 59
程序存儲(chǔ)器容量： 32KB（32K x 8）
程序存儲(chǔ)器類型： 閃存
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 2.7 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 16x10b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 68-LCC（J 形引線）
包裝： 管件
其它名稱： *COP8CCR9LVA8
SNOS535I – OCTOBER 2000 – REVISED MARCH 2013
Figure 5-3. Reset Circuit Using External Reset
5.7.2
On-Chip Brownout Reset
When enabled, the device generates an internal reset as VCC rises. While VCC is less than the specified
brownout voltage (Vbor), the device is held in the reset condition and the Idle Timer is preset with 00Fx
(240–256 tC). When VCC reaches a value greater than Vbor, the Idle Timer starts counting down. Upon
underflow of the Idle Timer, the internal reset is released and the device will start executing instructions.
This internal reset will perform the same functions as external reset. Once VCC is above the Vbor and this
initial Idle Timer time-out takes place, instruction execution begins and the Idle Timer can be used
normally. If, however, VCC drops below the selected Vbor, an internal reset is generated, and the Idle Timer
is preset with 00Fx. The device now waits until VCC is greater than Vbor and the countdown starts over.
When enabled, the functional operation of the device, at frequency, is ensured down to the Vbor level.
Figure 5-4. Brownout Reset Operation
One exception to the above is that the brownout circuit will insert a delay of approximately 3 ms on power
up or any time the VCC drops below a voltage of about 1.8V. The device will be held in Reset for the
duration of this delay before the Idle Timer starts counting the 240 to 256 tC. This delay starts as soon as
the VCC rises above the trigger voltage (approximately 1.8V). This behavior is shown in Figure 5-4.
In Case 1, VCC rises from 0V and the on-chip RESET is undefined until the supply is greater than
approximately 1.0V. At this time the brownout circuit becomes active and holds the device in RESET. As
the supply passes a level of about 1.8V, a delay of about 3 ms (td) is started and the Idle Timer is preset
to a value between 00F0 and 00FF (hex). Once VCC is greater than Vbor and td has expired, the Idle Timer
is allowed to count down (tid).
28
Functional Description
Copyright 2000–2013, Texas Instruments Incorporated
Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9
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