參數(shù)資料
型號(hào): PIC16C56A
廠商: Microchip Technology Inc.
元件分類: 8位微控制器
英文描述: EPROM/ROM-Based 8-Bit CMOS Microcontroller Series(每個(gè)I/O有20mA吸收/25mA驅(qū)動(dòng),12個(gè)I/O,2.5V的微控制器)
中文描述: 存儲(chǔ)器/基于ROM的8位CMOS微控制器系列(每個(gè)的I / O有20mA的吸收/ 25mA電流驅(qū)動(dòng),12個(gè)的I / O,為2.5V的微控制器)
文件頁(yè)數(shù): 23/194頁(yè)
文件大?。?/td> 2646K
代理商: PIC16C56A
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2002 Microchip Technology Inc.
Preliminary
DS30453D-page 21
PIC16C5X
5.1
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 5-1.
The Power-On Reset circuit and the Device Reset
Timer (Section 5.2) 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 5-3. 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 5-4, 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 5-5 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 correctly. For
such situations, we recommend that external RC cir-
cuits be used to achieve longer POR delay times
(Figure 5-2).
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.
FIGURE 5-2:
EXTERNAL POWER-ON
RESET CIRCUIT (FOR
SLOW VDD POWER-UP)
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.
C
R1
R
D
MCLR
PIC16C5X
V
DD
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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PIC16C56A/JW 功能描述:8位微控制器 -MCU 1.5KB 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(chǔ)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
PIC16C56A-04/P 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 4 MHz 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(chǔ)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
PIC16C56A-04/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C56 DIP18
PIC16C56A-04/SO 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 4 MHz 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(chǔ)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
PIC16C56A-04/SS 功能描述:8位微控制器 -MCU 1.5KB 25 RAM 12 I/O 4 MHz SSOP20 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(chǔ)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