參數(shù)資料
型號(hào)： PIC16C54C
廠商： Microchip Technology Inc.
英文描述： EPROM/ROM-Based 8-Bit CMOS Microcontroller(18引腳、12個(gè)I/O端口、512位EPROM/ROM的8位CMOS微控制器)
中文描述： 存儲(chǔ)器/基于ROM的8位CMOS微控制器（18引腳，12個(gè)的I / O，512位存儲(chǔ)器端口/光盤的8位的CMOS微控制器）
文件頁(yè)數(shù)： 39/158頁(yè)
文件大小： 1194K
代理商： PIC16C54C
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2000 Microchip Technology Inc.
Preliminary
DS30453C-page 39
PIC16C5X
7.5
Device Reset Timer (DRT)
The Device Reset Timer (DRT) provides a fixed 18 ms
nominal time-out on RESET. The DRT operates on an
internal RC 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 stabi-
lize.
Oscillator circuits based on crystals or ceramic resona-
tors require a certain time after power-up to establish a
stable oscillation. The on-chip DRT keeps the device in
a RESET condition for approximately 18 ms after the
voltage on the MCLR/V
PP
pin has reached a logic high
(V
IH
) level. Thus, external RC networks connected to
the MCLR input are not required in most cases, allow-
ing for savings in cost-sensitive and/or space restricted
applications.
The Device Reset time delay will vary from device to
device due to V
DD
, temperature, and process variation.
See AC parameters for details.
The DRT will also be triggered upon a Watchdog Timer
time-out. This is particularly important for applications
using the WDT to wake the PIC16C5X from SLEEP
mode automatically.
7.6
Watchdog Timer (WDT)
The Watchdog Timer (WDT) is a free running on-chip
RC oscillator which does not require any external com-
ponents. This RC oscillator is separate from the RC
oscillator of the OSC1/CLKIN pin. That means that the
WDT will run even if the clock on the OSC1/CLKIN and
OSC2/CLKOUT pins have 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 Watch-
dog Timer Reset.
The WDT can be permanently disabled by program-
ming the configuration bit WDTE as a
’
0
’
(Section 7.1).
Refer to the PIC16C5X Programming Specifications
(Literature Number DS30190) to determine how to
access the configuration word.
7.6.1
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 sec-
onds before a WDT time-out occurs.
7.6.2
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 max-
imum SLEEP time before a WDT Wake-up Reset.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PIC16C54C/JW 功能描述:8位微控制器 -MCU .75KB 25 RAM 12 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
PIC16C54C-04/P 功能描述:8位微控制器 -MCU .75KB 25 RAM 12 I/O 4MHz PDIP18 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
PIC16C54C-04/P 制造商:Microchip Technology Inc 功能描述:IC 8BIT CMOS MCU 16C54 DIP18
PIC16C54C04/SO 制造商:Microchip Technology 功能描述:8 PIC16C 4MHz 18SOIC 制造商:Microchip Technology 功能描述:8 PIC16C 4MHz 18SOIC Bulk
PIC16C54C-04/SO 功能描述:8位微控制器 -MCU .75KB 25 RAM 12 I/O 4MHz SOIC18 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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