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參數(shù)資料
| 型號： | MR80C32-20/883:D |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, 20 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | LCC-44 |
| 文件頁數(shù)： | 85/103頁 |
| 文件大?。?/td> | 25028K |
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175
8272E–AVR–04/2013
ATmega164A/PA/324A/PA/644A/PA/1284/P
19. USART
19.1
Features
Full duplex operation (independent serial receive and transmit registers)
Asynchronous or synchronous operation
Master or Slave clocked synchronous operation
High resolution baud rate generator
Supports Serial Frames with 5, 6, 7, 8, or 9 data bits and 1 or 2 stop bits
Odd or even parity generation and parity check supported by hardware
Data OverRun detection
Framing Error detection
Noise filtering includes False Start bit detection and Digital Low Pass Filter
Three separate interrupts on TX complete, TX Data Register Empty and RX Complete
Multi-processor Communication mode
Double Speed Asynchronous Communication mode
19.2
USART1 and USART0
The Atmel ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P has two USART’s,
USART0 and USART1.
The functionality for all USART’s is described below, most register and bit references in this sec-
tion are written in general form. A lower case “n” replaces the USART number.
USART0 and USART1 have different I/O registers as shown in ”Register summary” on page
19.3
Overview
The Universal Synchronous and Asynchronous serial Receiver and Transmitter (USART) is a
highly flexible serial communication device.
A simplified block diagram of the USART Transmitter is shown in Figure 19-1 on page 176. CPU
accessible I/O Registers and I/O pins are shown in bold.
The Power Reducion USART0 bit, PRUSART0, in ”PRR0 – Power Reduction Register 0” on
page 48 must be disabled by writing a logical zero to it.
The Power Reducion USART1 bit, PRUSART1, in ”PRR1 – Power Reduction Register 1” on
page 49 must be disabled by writing a logical zero to it.
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