參數(shù)資料
型號: 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
文件頁數(shù): 75/96頁
文件大?。?/td> 846K
代理商: ST7FLCD1G9M1
ST7FLCD1
8-bit Timer (TIMA)
13
8-bit Timer (TIMA)
13.1
Introduction
Timer A is an 8-bit programmable free-running downcounter driven by a programmable prescaler.
This block also has a buzzer. The block diagram is shown in Figure 41.
13.2
Main Features
Programmable Prescaler: fCPU divided by 1, 8 or 64.
Overflow status flag and maskable interrupt
Reduced power mode
Independent buzzer output with 4 programmable tones
13.3
Functional Description
Timer A is a 8-bit downcounter and its associated 8-bit register is loaded as start value of the
downcounter each time it has reached the 00h value. A flag indicates that the downcounter rolled
over the 00h value. The buzzer has 4 distinct tones. Before the downcounter prescaler block, the
frequency is divided by 2048.
fTIMER = fCPU/2048
Note:
In One-shot mode, the counter stops at 00h (low power state).
Figure 41: Timer A (TIMA) Block Diagram
8-bit downcounter
Preload Register
Prescaler
OVF
OVFE
BUZE
fCPU
OVF Interrupt
Buzzer
Prescaler
Request
TIMCSRA
8
TAR
fTIMER
TIMCPRA
1 / 8 / 64
TB1
TB0
BUZ1 BUZ0
Fixed
Prescaler
% 2048
Interrupt
BUZOUT
Buzzer
Output
Pin
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