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ST7FLCD1 Datasheet(PDF) 77 Page - STMicroelectronics

No. de pieza ST7FLCD1
Descripción Electrónicos  8-bit MCU for LCD Monitors with 60 KBytes Flash,2 KBytes RAM, 2 DDC Ports and Infrared Controller
PDF  95 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST7FLCD1 Datasheet(HTML) 77 Page - STMicroelectronics

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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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