參數(shù)資料
型號(hào)： ST7FLCD1G9M1
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 24 MHz, MICROCONTROLLER, PDSO28
封裝： ROHS COMPLIANT, SO-28
文件頁(yè)數(shù)： 79/96頁(yè)
文件大?。?/td> 846K
代理商： ST7FLCD1G9M1
8-bit Timer with External Trigger (TIMB)
ST7FLCD1
14
8-bit Timer with External Trigger (TIMB)
14.1
Introduction
Timer B is an 8 bit-programmable free-running downcounter, driven by a programmable prescaler.
An external signal can also trigger the countdown. The Timer B block diagram is shown in
14.2
Main Features
● Programmable Prescaler: fCPU divided by 1, 8 or 16
● Overflow status flag and maskable interrupt
● Auto reload capability
● An external signal with programmable polarity can trigger the count-down
14.3
Functional Description
The 8 bit-downcounter timer counts from a start value down to 00h. The start value is preloaded
from the associated 8-bit TIMCPRB register every time it is written, or when the counter has
reached the 00h value (Auto Reload feature) if the TAR bit is set. The OVF flag is set when the
downcounter reaches 00h. An interrupt is generated if the OVFE bit is set.
When the EXT bit is set, an external signal edge triggers the countdown start. The EDG bit controls
the rising or falling signal edge. Once detected, the selected edge sets the EEF flag, preloads the
downcounter with the start value and starts the countdown as usual.
During the countdown, the downcounter cannot be retriggered and subsequent pulses occurring
after the countdown has started are ignored until the counter reaches 00h.
Figure 42: External Timer Block Diagram
8-bit downcounter
Prescaler
OVF
OVFE
OVF interrupt request
TIMCSRB
TAR
1 / 8 / 16
TB1
TB0
EXT
EDG
EEF
Preload register
8
TIMCPRB
Auto reload
EXTRIG
Interrupt
EDG
EEF
EXT
Control Logic
f
TIMER
fCPU
Fixed
Prescaler
% 128
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ST7FLI19BF1U6TR 功能描述:8位微控制器 -MCU 8-Bit MCU w/ Single Volt Flash 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
ST7FLI19BY1M3TR 功能描述:8位微控制器 -MCU 8 BITS MICROCONTR 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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