參數(shù)資料
型號： ST92E141K4D1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 16-BIT, UVPROM, 25 MHz, MICROCONTROLLER, CDIP32
封裝： WINDOWED, SHRINK, CERAMIC, DIP-32
文件頁數(shù)： 164/178頁
文件大?。?/td> 1097K
代理商： ST92E141K4D1
86/178
ST92141 - TIMER/WATCHDOG (WDT)
TIMER/WATCHDOG (Cont’d)
7.1.2 Functional Description
7.1.2.1 External Signals
The HW0SW1 pin can be used to permanently en-
able Watchdog mode. Refer to section 7.1.3.1 on
page 87.
The WDIN Input pin can be used in one of four
modes:
– Event Counter Mode
– Gated External Input Mode
– Triggerable Input Mode
– Retriggerable Input Mode
The WDOUT output pin can be used to generate a
square wave or a Pulse Width Modulated signal.
An interrupt, generated when the WDT is running
as the 16-bit Timer/Counter, can be used as a Top
Level Interrupt or as an interrupt source connected
to channel A0 of the external interrupt structure
(replacing the INT0 interrupt input).
The counter can be driven either by an external
clock, or internally by INTCLK divided by 4.
7.1.2.2 Initialisation
The prescaler (WDTPR) and counter (WDTRL,
WDTRH) registers must be loaded with initial val-
ues before starting the Timer/Counter. If this is not
done, counting will start with reset values.
7.1.2.3 Start/Stop
The ST_SP bit enables downcounting. When this
bit is set, the Timer will start at the beginning of the
following instruction. Resetting this bit stops the
counter.
If the counter is stopped and restarted, counting
will resume from the last value unless a new con-
stant has been entered in the Timer registers
(WDTRL, WDTRH).
A new constant can be written in the WDTRH,
WDTRL, WDTPR registers while the counter is
running. The new value of the WDTRH, WDTRL
registers will be loaded at the next End of Count
(EOC) condition while the new value of the
WDTPR register will be effective immediately.
End of Count is when the counter is 0.
When Watchdog mode is enabled the state of the
ST_SP bit is irrelevant.
7.1.2.4 Single/Continuous Mode
The S_C bit allows selection of single or continu-
ous mode.This Mode bit can be written with the
Timer stopped or running. It is possible to toggle
the S_C bit and start the counter with the same in-
struction.
Single Mode
On reaching the End Of Count condition, the Timer
stops, reloads the constant, and resets the Start/
Stop bit. Software can check the current status by
reading this bit. To restart the Timer, set the Start/
Stop bit.
Note: If the Timer constant has been modified dur-
ing the stop period, it is reloaded at start time.
Continuous Mode
On reaching the End Of Count condition, the coun-
ter automatically reloads the constant and restarts.
It is stopped only if the Start/Stop bit is reset.
7.1.2.5 Input Section
If the Timer/Counter input is enabled (INEN bit) it
can count pulses input on the WDIN pin. Other-
wise it counts the internal clock/4.
For instance, when INTCLK = 24MHz, the End Of
Count rate is:
2.79 seconds for Maximum Count
(Timer Const. = FFFFh, Prescaler Const. = FFh)
166 ns for Minimum Count
(Timer Const. = 0000h, Prescaler Const. = 00h)
The Input pin can be used in one of four modes:
– Event Counter Mode
– Gated External Input Mode
– Triggerable Input Mode
– Retriggerable Input Mode
The mode is configurable in the WDTCR.
7.1.2.6 Event Counter Mode
In this mode the Timer is driven by the external
clock applied to the input pin, thus operating as an
event counter. The event is defined as a high to
low transition of the input signal. Spacing between
trailing edges should be at least 8 INTCLK periods
(or 333ns with INTCLK = 24MHz).
Counting starts at the next input event after the
ST_SP bit is set and stops when the ST_SP bit is
reset.
9
相關(guān)PDF資料
PDF描述
ST92F120JV1T 16-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64
ST92F120V6T 16-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64
ST92F120V9T 16-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64
ST92F124R1T6 16-BIT, FLASH, 24 MHz, MICROCONTROLLER, PQFP64
ST92F150JDV1QCE 16-BIT, FLASH, 5 MHz, MICROCONTROLLER, PQFP100
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST92E163-EPB/US 功能描述:程序設(shè)計器 - 基于處理器 ST9 EPROM Programmer RoHS:否 制造商:Olimex Ltd. 產(chǎn)品:Programmers 工具用于評估:XMEGA, MegaAVR, tinyAVR 核心:AVR 接口類型:USB 工作電源電壓:1.8 V to 5.5 V
ST92F120-EPB/US 功能描述:可擦除可編程ROM ST9 可擦除可編程ROM PROG RoHS:否 制造商:Maxim Integrated 類型: 存儲容量:1024 bit 組織:1 K x 1 接口類型: 工作電流:5 uA 編程電壓: 工作電源電壓:2.8 V to 6 V 最大工作溫度:+ 85 C 安裝風格:Through Hole 封裝 / 箱體:TO-92
ST92F120V1Q7 功能描述:8位微控制器 -MCU Flash 128K SPI/I2C 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
ST92F120V9Q7 功能描述:8位微控制器 -MCU RO 511-ST92F150CV1QB 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
ST92F124R9TB 功能描述:8位微控制器 -MCU Flash 64K SCI/SPI/I2 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
發(fā)布緊急采購，3分鐘左右您將得到回復。

采購需求

(若只采購一條型號，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進入我的后臺，查看報價

*型號 *數(shù)量 廠商 批號 封裝
添加更多采購

我的聯(lián)系方式

*
*
*