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参数资料
| 型号： | PIC10F222T-E/OT |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, RISC MICROCONTROLLER, PDSO6 |
| 封装： | LEAD FREE, PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 35/80页 |
| 文件大小： | 1069K |
| 代理商： | PIC10F222T-E/OT |
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PIC10F220/222
DS41270D-page 38
Preliminary
2007 Microchip Technology Inc.
8.5
Device Reset Timer (DRT)
On the PIC10F220/222 devices, the DRT runs any time
the device is powered up.
The DRT operates on an internal oscillator. The pro-
cessor is kept in Reset as long as the DRT is active.
The DRT delay allows VDD to rise above VDD min. and
for the oscillator to stabilize.
The on-chip DRT keeps the devices in a Reset condi-
tion for approximately 1.125 ms after MCLR has
reached a logic high (VIH MCLR) level. Programming
GP3/MCLR/VPP as MCLR and using an external RC
network connected to the MCLR input is not required in
most cases. This allows savings in cost-sensitive and/
or space restricted applications, as well as allowing the
use of the GP3/MCLR/VPP pin as a general purpose
input.
The Device Reset Time delays will vary from chip-to-
chip due to VDD, temperature and process variation.
See AC parameters for details.
Reset sources are POR, MCLR, WDT time-out and
wake-up on pin change. See Section 8.9.2 “Wake-up
from Sleep”, Notes 1, 2 and 3.
TABLE 8-3:
DRT (DEVICE RESET TIMER
PERIOD)
8.6
Watchdog Timer (WDT)
The Watchdog Timer (WDT) is a free running on-chip
RC oscillator, which does not require any external
components. This RC oscillator is separate from the
internal 4/8 MHz oscillator. This means that the WDT
will run even if the main processor clock has been
stopped, for example, by execution of a SLEEP instruc-
tion. During normal operation or Sleep, a WDT Reset or
wake-up Reset, generates a device Reset.
The TO bit (STATUS<4>) will be cleared upon a
Watchdog Timer Reset.
The WDT can be permanently disabled by program-
ming the configuration WDTE as a ‘0’ (see Section 8.1
“Configuration Bits”). Refer to the PIC10F220/222
Programming Specification to determine how to access
the Configuration Word.
8.6.1
WDT PERIOD
The WDT has a nominal time-out period of 18 ms, (with
no prescaler). If a longer time-out period is desired, a
prescaler with a division ratio of up to 1:128 can be
assigned to the WDT (under software control) by writ-
ing to the OPTION register. Thus, a time-out period of
a nominal 2.3 seconds can be realized. These periods
vary with temperature, VDD and part-to-part process
variations (see DC specs).
Under worst-case conditions (VDD = Min., Temperature
= Max., max. WDT prescaler), it may take several
seconds before a WDT time-out occurs.
8.6.2
WDT PROGRAMMING
CONSIDERATIONS
The CLRWDT instruction clears the WDT and the
postscaler, if assigned to the WDT, and prevents it from
timing out and generating a device Reset.
The SLEEP instruction resets the WDT and the
postscaler, if assigned to the WDT. This gives the
maximum Sleep time before a WDT wake-up Reset.
Oscillator
POR Reset
Subsequent
Resets
INTOSC
1.125 ms (typical)
10
μs (typical)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PIC10F222TI/MC | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F222T-I/MC | 功能描述:8位微控制器 -MCU 0.75KB 23B RAM 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 |
| PIC10F222TI/OT | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F222T-I/OT | 功能描述:8位微控制器 -MCU 768 B FL 16 RAM 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 |
| PIC10F222T-I/OT | 制造商:Microchip Technology Inc 功能描述:8-Bit Microcontroller IC |
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