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| 型号： | COP8CBR9IMT8/NOPB |
| 厂商： | National Semiconductor |
| 文件页数： | 34/111页 |
| 文件大小： | 0K |
| 描述： | IC MCU EEPROM 8BIT 32K 48-TSSOP |
| 标准包装： | 38 |
| 系列： | COP8™ 8C |
| 核心处理器： | COP8 |
| 芯体尺寸： | 8-位 |
| 速度： | 20MHz |
| 连通性： | Microwire/Plus（SPI），UART/USART |
| 外围设备： | 欠压检测/复位，POR，PWM，WDT |
| 输入/输出数： | 39 |
| 程序存储器容量： | 32KB（32K x 8） |
| 程序存储器类型： | 闪存 |
| RAM 容量： | 1K x 8 |
| 电压 - 电源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 数据转换器： | A/D 16x10b |
| 振荡器型： | 内部 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 48-TFSOP（0.240"，6.10mm 宽） |
| 包装： | 管件 |
| 其它名称： | *COP8CBR9IMT8 *COP8CBR9IMT8/NOPB COP8CBR9IMT8 COP8CBR9IMT8-ND |
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SNOS535I – OCTOBER 2000 – REVISED MARCH 2013
Case 2 shows a subsequent dip in the supply voltage which goes below the approximate 1.8V level. As
VCC drops below Vbor, the internal RESET signal is asserted. When VCC rises back above the 1.8V level, td
is started. Since the power supply rise time is longer for this case, td has expired before VCC rises above
Vbor and tid starts immediately when VCC is greater than Vbor.
Case 3 shows a dip in the supply where VCC drops below Vbor, but not below 1.8V. On-chip RESET is
asserted when VCC goes below Vbor and tid starts as soon as the supply goes back above Vbor.
If the Brownout Reset feature is enabled, the internal reset will not be turned off until the Idle Timer
underflows. The internal reset will perform the same functions as external reset. The device is ensured to
operate at the specified frequency down to the specified brownout voltage. After the underflow, the logic is
designed such that no additional internal resets occur as long as VCC remains above the brownout
voltage.
The device is relatively immune to short duration negative-going VCC transients (glitches). It is essential
that good filtering of VCC be done to ensure that the brownout feature works correctly. Power supply
decoupling is vital even in battery powered systems.
There are two optional brownout voltages. The part numbers for the three versions of this device are:
COP8CBR, Vbor = low voltage range
COP8CCR, Vbor = high voltage range
COP8CDR, BOR is disabled.
Refer to the device specifications for the actual Vbor voltages.
High brownout voltage devices are ensured to operate at 10MHz down to the brownout voltage. Low
brownout voltage devices are ensured to operate at 3.33MHz down to the brownout voltage. Devices are
not ensured to operate at 10MHz down to the low brownout voltage.
Under no circumstances should the RESET pin be allowed to float. If the on-chip Brownout Reset feature
is being used, the RESET pin should be connected directly to VCC. The RESET input may also be
connected to an external pull-up resistor or to other external circuitry. Any rising edge on the RESET pin
while VCC is below the specified operating range may cause unpredictable results. The output of the
brownout reset detector will always preset the Idle Timer to a value between 00F0 and 00FF (240 to 256
tC). At this time, the internal reset will be generated.
If the BOR feature is disabled, then no internal resets are generated and the Idle Timer will power-up with
an unknown value. In this case, the external RESET must be used. When BOR is disabled, this on-chip
circuitry is disabled and draws no DC current.
The contents of data registers and RAM are unknown following the on-chip reset.
Figure 5-5. Reset Circuit Using Power-On Reset
5.8
OSCILLATOR CIRCUITS
The device has two crystal oscillators to facilitate low power operation while maintaining throughput when
required. Further information on the use of the two oscillators is found in Power Saving Features. The low
speed oscillator utilizes the L0 and L1 port pins. References in the following text to CKI will also apply to
L0 and references to G7/CKO will also apply to L1.
Copyright 2000–2013, Texas Instruments Incorporated
Functional Description
29
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