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参数资料
| 型号： | PIC16LC433E/P |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, OTPROM, 4 MHz, RISC MICROCONTROLLER, PDIP18 |
| 封装： | 0.300 INCH, PLASTIC, DIP-18 |
| 文件页数： | 75/122页 |
| 文件大小： | 1862K |
| 代理商： | PIC16LC433E/P |
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PIC16C433
DS41139A-page 54
Advance Information
2001 Microchip Technology Inc.
9.4
Power-on Reset (POR), Power-up
Timer (PWRT) and Oscillator Start-up
Timer (OST)
9.4.1
POWER-ON RESET (POR)
The on-chip POR circuit holds the chip in RESET until
VDD has reached a high enough level for proper oper-
ation. To take advantage of the POR, just tie the MCLR
pin through a resistor to VDD. This will eliminate exter-
nal RC components usually needed to create a Power-
on Reset. A maximum rise time for VDD is specified.
See 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 additional information, refer to Application Note
AN607, "Power-up Trouble Shooting."
9.4.2
POWER-UP TIMER (PWRT)
The Power-up Timer provides a fixed 72 ms nominal
time-out 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 VDD 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 VDD, temperature and process variation.
9.4.3
OSCILLATOR START-UP TIMER (OST)
The Oscillator Start-up Timer (OST) provides 1024
oscillator cycle (from OSC1 input) delay after the
PWRT delay is over. This ensures that the crystal oscil-
lator, 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.
9.4.4
TIME-OUT SEQUENCE
On power-up, the Time-out Sequence is as follows:
first, PWRT time-out is invoked after the POR time
delay has expired; then, OST is activated. The total
time-out will vary, based on oscillator configuration and
the status of the PWRT. For example, in RC mode with
the PWRT disabled, there will be no time-out at all.
Figure 9-7, Figure 9-8, and Figure 9-9 depict time-out
sequences on power-up.
Since the time-outs occur from the POR pulse, if MCLR
is kept low long enough, the time-outs will expire. Then
bringing MCLR high will begin execution immediately
(Figure 9-9). This is useful for testing purposes, or to
synchronize more than one PIC16C433 device operat-
ing in parallel.
9.4.5
POWER CONTROL/STATUS REGISTER
(PCON)
The Power Control/Status Register, PCON (address
8Eh), has one bit.
Bit1 is POR (Power-on Reset). It is cleared on a Power-
on Reset and is unaffected otherwise. The user sets
this bit following a Power-on Reset. On subsequent
RESETS, if POR is ‘0’, it will indicate that a Power-on
Reset must have occurred.
TABLE 9-4:
TIME-OUT IN VARIOUS SITUATIONS
TABLE 9-5:
STATUS/PCON BITS AND THEIR SIGNIFICANCE
Legend: u = unchanged, x = unknown
Oscillator Configuration
Power-up
Wake-up from SLEEP
PWRTE = 0
PWRTE = 1
XT, HS, LP
72 ms + 1024TOSC
1024TOSC
INTRC, EXTRC
72 ms
——
POR
TO
PD
01
1
Power-on Reset
00
x
Illegal, TO is set on POR
0x
0
Illegal, PD is set on POR
10
u
WDT Reset
10
0
WDT Wake-up
1u
u
MCLR Reset during normal operation
11
0
MCLR Reset during SLEEP or interrupt wake-up from SLEEP
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC16LC433-I/P | 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16LC433-I/SO | 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16LC433T-I/SO | 功能描述:8位微控制器 -MCU 10MHz 2K EPROM RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16LC505-04/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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
| PIC16LC505-04/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 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT |
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