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| 型號(hào)： | PIC10F202T |
| 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(yè)數(shù)： | 48/86頁(yè) |
| 文件大小： | 620K |
| 代理商： | PIC10F202T |
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PIC10F200/202/204/206
DS41239B-page 46
Preliminary
2005 Microchip Technology Inc.
9.5
Device Reset Timer (DRT)
On the PIC10F200/202/204/206 devices, the DRT runs
any time the device is powered up.
The DRT operates on an internal oscillator. The
processor 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
condition for approximately 18 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 9.9.2 “Wake-up
from Sleep”, Notes 1, 2 and 3
.
TABLE 9-3:
DRT (DEVICE RESET TIMER
PERIOD)
9.6
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 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
instruction.
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 9.1
“Configuration Bits”
). Refer to the PIC10F200/202/
204/206 Programming Specifications to determine how
to access the Configuration Word.
9.6.1
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
writing to the OPTION register. Thus, a time-out period
of a nominal 2.3 seconds can be realized. These peri-
ods vary with temperature, V
DD
and part-to-part pro-
cess 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.
9.6.2
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
18 ms (typical)
10
μ
s (typical)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PIC10F200 | 6-Pin, 8-Bit Flash Microcontrollers |
| PIC10F200T | 6-Pin, 8-Bit Flash Microcontrollers |
| PIC10F202 | 6-Pin, 8-Bit Flash Microcontrollers |
| PIC10F204 | 6-Pin, 8-Bit Flash Microcontrollers |
| PIC10F204T | 6-Pin, 8-Bit Flash Microcontrollers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PIC10F202T-E/MC | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:6-Pin, 8-Bit Flash Microcontrollers |
| PIC10F202T-E/OT | 功能描述:8位微控制器 -MCU .75kBF 24RM 4I/O Ext Temp SOT-23 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 |
| PIC10F202T-E/P | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:6-Pin, 8-Bit Flash Microcontrollers |
| PIC10F202T-I/MC | 功能描述:8位微控制器 -MCU 0.75KB Fl 24B RAM 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 |
| PIC10F202T-I/OT | 功能描述:8位微控制器 -MCU .75kBF 24RM 4I/O Ind Temp SOT-23 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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