參數(shù)資料
型號(hào): AT89C5115-RATUM
廠商: Atmel
文件頁數(shù): 58/113頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 16K 32VQFP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 1,250
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: UART/USART
外圍設(shè)備: POR,PWM,WDT
輸入/輸出數(shù): 20
程序存儲(chǔ)器容量: 16KB(16K x 8)
程序存儲(chǔ)器類型: 閃存
EEPROM 大小: 2K x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-LQFP
包裝: 托盤
配用: AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU
49
AT89C5115
4128G–8051–02/08
Serial I/O Port
The T89C5115 I/O serial port is compatible with the I/O serial port in the 80C52.
It provides both synchronous and asynchronous communication modes. It operates as a
Universal Asynchronous Receiver and Transmitter (UART) in three full-duplex modes
(Modes 1, 2 and 3). Asynchronous transmission and reception can occur simultaneously
and at different baud rates
Serial I/O port includes the following enhancements:
Framing error detection
Automatic address recognition
Figure 20. Serial I/O Port Block Diagram
Framing Error Detection
Framing bit error detection is provided for the three asynchronous modes. To enable the
framing bit error detection feature, set SMOD0 bit in PCON register.
Figure 21. Framing Error Block Diagram
When this feature is enabled, the receiver checks each incoming data frame for a valid
stop bit. An invalid stop bit may result from noise on the serial lines or from simultaneous
transmission by two CPUs. If a valid stop bit is not found, the Framing Error bit (FE) in
SCON register bit is set.
The software may examine the FE bit after each reception to check for data errors.
Once set, only software or a reset clears the FE bit. Subsequently received frames with
valid stop bits cannot clear the FE bit. When the FE feature is enabled, RI rises on the
stop bit instead of the last data bit (See Figure 22 and Figure 23).
Write SBUF
RI
TI
SBUF
Transmitter
SBUF
Receiver
IB Bus
Mode 0 Transmit
Receive
Shift register
Load SBUF
Read SBUF
SCON reg
Interrupt
Request
Serial Port
TXD
RXD
RI
TI
RB8
TB8
REN
SM2
SM1
SM0/FE
IDL
PD
GF0
GF1
POF
-
SMOD0
SMOD1
To UART Framing Error Control
SM0 to UART Mode Control
Set FE bit if Stop bit is 0 (Framing Error)
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