參數(shù)資料
型號(hào)： PIC12F519
廠(chǎng)商： Microchip Technology Inc.
英文描述： 8-Pin, 8-Bit Flash Microcontroller
中文描述： 8引腳，8位閃存微控制器
文件頁(yè)數(shù)： 43/88頁(yè)
文件大?。?/td> 802K
代理商： PIC12F519
2007 Microchip Technology Inc.
Preliminary
DS41319A-page 41
PIC12F519
8.3.1
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 8-6.
FIGURE 8-6:
MCLR SELECT
8.4
Power-on Reset (POR)
The PIC12F519 device incorporates an on-chip
Power-on Reset (POR) circuitry, which provides an
internal chip Reset for most power-up situations.
The on-chip POR circuit holds the chip in Reset until
V
DD
has reached a high enough level for proper oper-
ation. To take advantage of the internal POR, program
the RB3/MCLR/V
PP
pin as MCLR and tie through a
resistor to V
DD
, or program the pin as RB3, in which
case, an internal weak pull-up resistor is implemented
using a transistor (refer to Table 11-2 for the pull-up
resistor ranges). This will eliminate external RC compo-
nents usually needed to create a Power-on Reset. A
maximum rise time for V
DD
is specified. See
Section 11.0 “Electrical Characteristics”
for details.
When the devices start normal operation (exit the
Reset condition), device operating parameters (volt-
age, frequency, temperature,...) must be met to ensure
operation. If these conditions are not met, the devices
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 8-7.
The Power-on Reset circuit and the Device Reset
Timer (see
Section 8.5 “Device Reset Timer (DRT)”
)
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 or 1 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 8-8. V
DD
is allowed to rise and stabilize before
bringing MCLR high. The chip will actually come out of
Reset T
DRT
after MCLR goes high.
In Figure 8-9, 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 8-10 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 may not function correctly. For such situations, we
recommend that external RC circuits be used to
achieve longer POR delay times (Figure 8-9).
RB3/MCLR/V
PP
MCLRE
Internal MCLR
RBWU
Note:
When the devices start normal operation
(exit the Reset condition), device operat-
ing 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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC12F519_08 制造商:MICROCHIP 制造商全稱(chēng):Microchip Technology 功能描述:8-Pin, 8-Bit Flash Microcontrollers
PIC12F519-E/MC 功能描述:8位微控制器 -MCU 15KB Flash Prgrm 64B 8MHz Intrnl Oscilatr RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)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
PIC12F519-E/MS 功能描述:8位微控制器 -MCU 15KB Flash Prgrm 64B 8MHz Intrnl Oscilatr RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)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
PIC12F519-E/P 功能描述:8位微控制器 -MCU 15KB Flash Prgrm 64B 8MHz Intrnl Oscilatr RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)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
PIC12F519-E/SN 功能描述:8位微控制器 -MCU 15KB Flash Prgrm 64B 8MHz Intrnl Oscilatr RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線(xiàn)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
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