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參數(shù)資料
| 型號： | PIC10F220 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 6-Pin, 8-Bit Flash Microcontrollers |
| 中文描述： | 6引腳，8位閃存微控制器 |
| 文件頁數(shù)： | 40/78頁 |
| 文件大小： | 583K |
| 代理商： | PIC10F220 |
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PIC10F220/222
DS41270B-page 38
Preliminary
2006 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 V
DD
to rise above V
DD
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 (V
IH
MCLR) level. Programming
GP3/MCLR/V
PP
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/V
PP
pin as a general purpose
input.
The Device Reset Time delays will vary from chip-to-
chip due to V
DD
, 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, V
DD
and part-to-part process
variations (see DC specs).
Under worst-case conditions (V
DD
= 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
μ
s (typical)
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相關(guān)代理商/技術(shù)參數(shù) |
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| PIC10F220_1 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F220E/MC | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F220-E/MC | 功能描述:8位微控制器 -MCU 384B Flash16B RAM4 I/O8bit ADC 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
| PIC10F220E/OT | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:High-Performance Microcontrollers with 8-bit A/D |
| PIC10F220-E/OT | 功能描述:8位微控制器 -MCU 384B Flash 16B RAM 4 I/O 8bit ADC 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 最大時鐘頻率:50 MHz 程序存儲器大小: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 安裝風格:SMD/SMT |
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