參數資料
型號： PIC16F819
廠商： Microchip Technology Inc.
英文描述： 18/20-Pin Enhanced FLASH Microcontrollers with nanoWatt Technology(18/20引腳，納瓦技術增強FLASH微控制器)
中文描述： 18/20-Pin增強型閃存微控制器采用納瓦技術（18/20引腳，納瓦技術增強閃存微控制器）
文件頁數： 94/164頁
文件大?。?/td> 3045K
代理商： PIC16F819
PIC16F818/819
DS39598C-page 92
Preliminary
2002 Microchip Technology Inc.
12.3
MCLR
PIC16F818/819 device has a noise filter in the MCLR
Reset path. The filter will detect and ignore small
pulses.
It should be noted that a WDT Reset
does not drive
MCLR pin low.
The behavior of the ESD protection on the MCLR pin
has been altered from previous devices of this family.
Voltages applied to the pin that exceed its specification
can result in both MCLR and excessive current beyond
the device specification during the ESD event. For this
reason, Microchip recommends that the MCLR pin no
longer be tied directly to V
DD
. The use of an
RC network, as shown in Figure 12-2, is suggested.
The RA5/MCLR pin can be configured for MCLR
(default), or as an I/O pin (RA5). This is configured
through the MCLRE bit in the Configuration register.
FIGURE 12-2:
RECOMMENDED MCLR
CIRCUIT
12.4
Power-on Reset (POR)
A Power-on Reset pulse is generated on-chip when
V
DD
rise is detected (in the range of 1.2V - 1.7V). To
take advantage of the POR, tie the MCLR pin to V
DD
as
described in Section 12.3. A maximum rise time for
V
DD
is specified. See the Electrical Specifications for
details.
When the device starts normal operation (exits the
RESET condition), device operating parameters (volt-
age, frequency, temperature,...) 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. For more information, see Application Note,
AN607 - “Power-up Trouble Shooting”
(DS00607).
12.5
Power-up Timer (PWRT)
The Power-up Timer (PWRT) of the PIC16F818/819 is
a counter that uses the INTRC oscillator as the clock
input. This yields a count of 72 ms. While the PWRT is
counting, the device is held in RESET.
The power-up time delay depends on the INTRC, and
will vary from chip-to-chip due to temperature and
process variation. See DC parameter #33 for details.
The PWRT is enabled by clearing configuration bit
PWRTEN.
12.6
Oscillator Start-up Timer (OST)
The Oscillator Start-up Timer (OST) provides 1024
oscillator cycles (from OSC1 input) delay after the
PWRT delay is over (if enabled). This helps to ensure
that the crystal oscillator or resonator has started and
stabilized.
The OST time-out is invoked only for XT, LP and HS
modes and only on Power-on Reset, or wake-up from
SLEEP.
12.7
Brown-out Reset (BOR)
The configuration bit, BOREN, can enable or disable
the Brown-out Reset circuit. If V
DD
falls below V
BOR
(parameter D005, about 4V) for longer than T
BOR
(parameter #35, about 100
μ
s), the brown-out situation
will reset the device. If V
DD
falls below V
BOR
for less
than T
BOR
, a RESET may not occur.
Once the brown-out occurs, the device will remain in
Brown-out Reset until V
DD
rises above V
BOR
. The
Power-up Timer (if enabled) will keep the device in
RESET for T
PWRT
(parameter #33, about 72 ms). If
V
DD
should fall below V
BOR
during T
PWRT
, the Brown-
out Reset process will restart when V
DD
rises above
V
BOR
, with the Power-up Timer Reset. Unlike previous
PIC16 devices, the PWRT is no longer automatically
enabled when the Brown-out Reset circuit is enabled.
The PWRTEN and BOREN configuration bits are
independent of each other.
12.8
Time-out Sequence
On power-up, the time-out sequence is as follows: the
PWRT delay starts (if enabled) when a POR occurs.
Then, OST starts counting 1024 oscillator cycles when
PWRT ends (LP, XT, HS). When the OST ends, the
device comes out of RESET.
If MCLR is kept low long enough, all delays will expire.
Bringing MCLR high will begin execution immediately.
This is useful for testing purposes or to synchronize
more than one PIC16F818/819 device operating in
parallel.
Table 12-3 shows the RESET conditions for the
STATUS, PCON and PC registers, while Table 12-4
shows the RESET conditions for all the registers.
C1
0.1
μ
F
(optional, not critical)
R1
1 k
(or greater)
V
DD
MCLR
PIC16F818/819
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相關代理商/技術參數
參數描述
PIC16F819-E/ML 功能描述:8位微控制器 -MCU 3.5KB 256 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
PIC16F819-E/P 功能描述:8位微控制器 -MCU 3.5KB 256 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
PIC16F819-E/SO 功能描述:8位微控制器 -MCU 3.5KB 256 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
PIC16F819-E/SS 功能描述:8位微控制器 -MCU 3.5KB 256 RAM 16 I/O RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數據總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數據 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 安裝風格:SMD/SMT
PIC16F819-E/SSVAO 制造商:Microchip Technology Inc 功能描述:
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