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| 型號： | PIC16C505 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 14-Pin, 8-Bit CMOS Microcontroller(每個I/O口有25mA驅(qū)動/吸收電流,12個I/O口，帶WDT的微控制器) |
| 中文描述： | 14引腳，8位CMOS微控制器（每個的I / O口有25毫安驅(qū)動/吸收電流，12個的I / O口，帶看門狗的微控制器） |
| 文件頁數(shù)： | 32/80頁 |
| 文件大?。?/td> | 617K |
| 代理商： | PIC16C505 |
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PIC16C505
DS40192A-page 32
Preliminary
1998 Microchip Technology Inc.
7.3.1
MCLR ENABLE
This configuration bit when unprogrammed (left in the
‘1’ state) enables the external MCLR function. When
programmed, the MCLR function is tied to the internal
V
DD
, and the pin is assigned to be a I/O. See Figure 7-
7.
FIGURE 7-7:
MCLR SELECT
7.4
Power-On Reset (POR)
The PIC16C505 family incorporates on-chip Power-On
Reset (POR) circuitry which provides an internal chip
reset for most power-up situations.
A Power-on Reset pulse is generated on-chip when
V
DD
rise is detected (in the range of 2.3V - 2.8V). To
take advantage of the internal POR, program the RB3/
MCLR/V
PP
pin as MCLR and tie directly to V
DD
or pro-
gram the pin as RB3. An internal weak pull-up resistor
is implemented using a transistor. Refer to Table 10-6
for the pull-up resistor ranges. This will eliminate exter-
nal RC components usually needed to create a Power-
on Reset. A maximum rise time for V
DD
is specified.
See Electrical Specifications for details.
When the device starts normal operation (exits the
reset condition), device operating parameters (voltage,
frequency, temperature, ...) must be met to ensure
operation. If these conditions are not met, the device
must be held in reset until the operating parameters are
met.
A simplified block diagram of the on-chip Power-On
Reset circuit is shown in Figure 7-8.
RB3/MCLR/V
PP
MCLRE
INTERNAL MCLR
WEAK
PULL-UP
RBWU
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 held low is
shown in Figure 7-9. V
DD
is allowed to rise and
stabilize before bringing MCLR high. The chip will
actually come out of reset T
DRT
msec after MCLR
goes high.
In Figure 7-10, the on-chip Power-On Reset feature is
being used (MCLR and V
DD
are tied together or the
pin is programmed to be RB3.). 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-
11 depicts a problem situation where V
DD
rises too
slowly. The time between when the DRT senses that
MCLR is high and when MCLR (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 correctly. For such situations,
we recommend that external RC circuits be used to
achieve longer POR delay times (Figure 7-10).
For additional information refer to Application Notes
“Power-Up Considerations”- AN522 and “Power-up
Trouble Shooting” - AN607.
Note:
When the device starts normal operation
(exits the reset condition), device operat-
ing parameters (voltage, frequency, tem-
perature, etc.) must be meet to ensure
operation. If these conditions are not met,
the device must be held in reset until the
operating conditions are met.
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| PIC16C505/JW | 功能描述:8位微控制器 -MCU 1.5KB 72 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 |
| PIC16C505-04/P | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz PDIP14 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 |
| PIC16C505-04/P | 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU (TUBE 30) 16C505 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C505 DIP14 |
| PIC16C505-04/SL | 功能描述:8位微控制器 -MCU 1.5KB 72 RAM 12 I/O 4MHz SOIC14 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 |
| PIC16C505-04/SL | 制造商:Microchip Technology Inc 功能描述:8BIT CMOS MCU SMD 16C505 SOIC14 |
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