參數(shù)資料
型號(hào)： PIC16LC712T
廠商： Microchip Technology Inc.
英文描述： 8-Bit CMOS Microcontrollers with A/D Converter and Capture/Compare/PWM
中文描述： 8位CMOS微控制器與A / D轉(zhuǎn)換器和捕捉/比較/ PWM
文件頁數(shù)： 55/108頁
文件大?。?/td> 1810K
代理商： PIC16LC712T
1999 Microchip Technology Inc.
Preliminary
DS41106A-page 55
PIC16C712/716
9.4
Power-On Reset (POR)
A Power-on Reset pulse is generated on-chip when
V
DD
rise is detected (to a level of 1.5V - 2.1V). To take
advantage of the POR, just tie the MCLR pin directly (or
through a resistor) to V
DD
. This will eliminate external
RC components usually needed to create a Power-on
Reset. A maximum rise time for V
DD
is specified
(parameter D004). For a slow rise time, see Figure 9-5.
When the device starts normal operation (exits the
reset condition), device operating parameters (voltage,
frequency, temperature,...) must be met to ensure oper-
ation. If these conditions are not met, the device must
be held in reset until the operating conditions are met.
Brown-out Reset may be used to meet the start-up con-
ditions.
FIGURE 9-5:
EXTERNAL POWER-ON
RESET CIRCUIT (FOR SLOW
V
DD
POWER-UP)
Note1:
External Power-on Reset circuit is required
only if V
DD
power-up slope is too slow. The
diode D helps discharge the capacitor
quickly when V
DD
powers down.
2:
R < 40 k
is recommended to make sure
that voltage drop across R does not violate
the device’s electrical specification.
3:
R1 = 100
to 1 k
will limit any current
flowing into MCLR from external capacitor
C in the event of MCLR/V
PP
pin break-
down due to Electrostatic Discharge
(ESD) or Electrical Overstress (EOS).
C
R1
R
V
DD
MCLR
PIC16C7XX
V
DD
9.5
Power-up Timer (PWRT)
The Power-up Timer provides a fixed nominal time-out
(parameter #33), on power-up only, from the POR. The
Power-up Timer operates on an internal RC oscillator.
The chip is kept in reset as long as the PWRT is active.
The PWRT’s time delay allows V
DD
to rise to an accept-
able level. A configuration bit is provided to enable/dis-
able the PWRT.
The power-up time delay will vary from chip to chip due
to V
DD
, temperature, and process variation. See DC
parameters for details.
9.6
Oscillator Start-up Timer (OST)
The Oscillator Start-up Timer (OST) provides a 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over (parameter #32). This ensures that
the crystal oscillator or resonator has started and stabi-
lized.
The OST time-out is invoked only for XT, LP and HS
modes and only on Power-on Reset or wake-up from
SLEEP.
9.7
Brown-Out Reset (BOD)
The PIC16C712/716 members have on-chip Brown-out
Reset circuitry. A configuration bit, BODEN, can disable
(if clear/programmed) or enable (if set) the Brown-out
Reset circuitry. If V
DD
falls below 4.0V, refer to V
BOR
parameter D005(V
BOR
) for a time greater than param-
eter (T
BOR
) in Table 12-6. The brown-out situation will
reset the chip. A reset is not guaranteed to occur if V
DD
falls below 4.0V for less than parameter (T
BOR
).
On any reset (Power-on, Brown-out, Watchdog, etc.)
the chip will remain in Reset until V
DD
rises above
V
BOR
. The Power-up Timer will now be invoked and will
keep the chip in reset an additional 72 ms.
If V
DD
drops below V
BOR
while the Power-up Timer is
running, the chip will go back into a Brown-out Reset
and the Power-up Timer will be re-initialized. Once V
DD
rises above V
BOR
, the Power-Up Timer will execute a
72 ms reset. The Power-up Timer should always be
enabled when Brown-out Reset is enabled. Figure 9-7
shows typical Brown-out situations.
For operations where the desired brown-out voltage is
other than 4V, an external brown-out circuit must be
used. Figure 9-8, 9-9 and 9-10 show examples of exter-
nal brown-out protection circuits.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16LC712T-04/SO 功能描述:8位微控制器 -MCU 1.75KB 128RAM 13 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
PIC16LC712T-04/SS 功能描述:8位微控制器 -MCU 1.75KB 128RAM 13 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
PIC16LC712T-04I/SO 功能描述:8位微控制器 -MCU 1.75KB 128RAM 13 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
PIC16LC712T-04I/SS 功能描述:8位微控制器 -MCU 1.75KB 128RAM 13 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
PIC16LC715-04/P 功能描述:8位微控制器 -MCU 3.5KB 128 RAM 13 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
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