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| 型號： | PIC16C54C |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | EPROM/ROM-Based 8-Bit CMOS Microcontroller(18引腳、12個(gè)I/O端口、512位EPROM/ROM的8位CMOS微控制器) |
| 中文描述： | 存儲器/基于ROM的8位CMOS微控制器（18引腳，12個(gè)的I / O，512位存儲器端口/光盤的8位的CMOS微控制器） |
| 文件頁數(shù)： | 37/158頁 |
| 文件大?。?/td> | 1194K |
| 代理商： | PIC16C54C |
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2000 Microchip Technology Inc.
Preliminary
DS30453C-page 37
PIC16C5X
7.4
Power-on Reset (POR)
The PIC16C5X family incorporates on-chip Power-on
Reset (POR) circuitry which provides an internal chip
RESET for most power-up situations. To use this fea-
ture, the user merely ties the MCLR/V
PP
pin to V
DD
. A
simplified block diagram of the on-chip Power-on Reset
circuit is shown in Figure 7-8.
The Power-on Reset circuit and the Device Reset
Timer (Section 7.5) circuit are closely related. On
power-up, the Reset Latch is set and the DRT is
RESET. The DRT timer begins counting once it detects
MCLR to be high. After the time-out period, which is
typically 18 ms, it will reset the Reset Latch and thus
end the on-chip RESET signal.
A power-up example where MCLR is not tied to V
DD
is
shown in Figure 7-10. V
DD
is allowed to rise and stabi-
lize before bringing MCLR high. The chip will actually
come out of RESET T
DRT
msec after MCLR goes high.
In Figure 7-11, the on-chip Power-on Reset feature is
being used (MCLR and V
DD
are tied together). The V
DD
is stable before the start-up timer times out and there is
no problem in getting a proper RESET. However,
Figure 7-12 depicts a problem situation where V
DD
rises too slowly. The time between when the DRT
senses a high on the MCLR/V
PP
pin, and when the
MCLR/V
PP
pin (and V
DD
) actually reach their full value,
is too long. In this situation, when the start-up timer
times out, V
DD
has not reached the V
DD
(min) value and
the chip is, therefore, not guaranteed to function cor-
rectly. For such situations, we recommend that external
(RESET) BOR circuits or external RC circuits be used
to achieve longer POR delay times (Figure 7-9).
For more information on PIC16C5X POR, see
Power-Up Considerations
- AN522 in the Embedded
Control Handbook.
The POR circuit does not produce an internal RESET
when V
DD
declines.
Note:
When the device starts normal operation
(exits the RESET condition), device oper-
ating parameters (voltage, frequency, tem-
perature, etc.) must be met to ensure
operation. If these conditions are not met,
the device must be held in RESET until the
operating conditions are met.
FIGURE 7-9:
EXAMPLE OF EXTERNAL
POWER-ON RESET CIRCUIT
(FOR SLOW V
DD
POWER-UP)
V
DD
C
R1
R
D
MCLR
PIC16C5X
V
DD
External Power-on Reset circuit is required
only if V
DD
power-up is too slow. The diode D
helps discharge the capacitor quickly when
V
DD
powers down.
R < 40 k
is recommended to make sure that
voltage drop across R does not violate the
device electrical specification.
R1 = 100
to 1 k
will limit any current flow-
ing into MCLR from external capacitor C in the
event of MCLR pin breakdown due to Electro-
static Discharge (ESD) or Electrical Over-
stress (EOS).
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相關(guān)代理商/技術(shù)參數(shù) |
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| PIC16C54C/JW | 功能描述:8位微控制器 -MCU .75KB 25 RAM 12 I/O 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(shí)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 |
| PIC16C54C-04/P | 功能描述:8位微控制器 -MCU .75KB 25 RAM 12 I/O 4MHz PDIP18 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(shí)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 |
| PIC16C54C-04/P | 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C54 DIP18 |
| PIC16C54C04/SO | 制造商:Microchip Technology 功能描述:8 PIC16C 4MHz 18SOIC 制造商:Microchip Technology 功能描述:8 PIC16C 4MHz 18SOIC Bulk |
| PIC16C54C-04/SO | 功能描述:8位微控制器 -MCU .75KB 25 RAM 12 I/O 4MHz SOIC18 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(shí)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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