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| 型號： | ADUC831BSZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 51/76頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 62K FLASH ADC/DAC 52MQFP |
| 標準包裝： | 800 |
| 系列： | MicroConverter® ADuC8xx |
| 核心處理器： | 8052 |
| 芯體尺寸： | 8-位 |
| 速度： | 16MHz |
| 連通性： | EBI/EMI，I²C，SPI，UART/USART |
| 外圍設備： | PSM，溫度傳感器，WDT |
| 輸入/輸出數(shù)： | 34 |
| 程序存儲器容量： | 62KB（62K x 8） |
| 程序存儲器類型： | 閃存 |
| EEPROM 大?。?/td> | 4K x 8 |
| RAM 容量： | 2.25K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 數(shù)據(jù)轉換器： | A/D 8x12b，D/A 2x12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 52-QFP |
| 包裝： | 帶卷 (TR) |
| 配用： | EVAL-ADUC831QSZ-ND - KIT DEV FOR ADUC831 QUICK START |
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REV. 0
ADuC831
–55–
UART SERIAL INTERFACE
The serial port is full duplex, meaning it can transmit and receive
simultaneously. It is also receive-buffered, meaning it can com-
mence reception of a second byte before a previously received
byte has been read from the receive register. However, if the first
byte still has not been read by the time reception of the second
byte is complete, the first byte will be lost. The physical interface to
the serial data network is via pins RXD(P3.0) and TXD(P3.1),
while the SFR interface to the UART is comprised of SBUF
and SCON, as described below.
SBUF
The serial port receive and transmit registers are both accessed
through the SBUF SFR (SFR address = 99H). Writing to SBUF
loads the transmit register and reading SBUF accesses a physi-
cally separate receive register.
SCON
UART Serial Port Control Register
SFR Address
98H
Power-On Default Value
00H
Bit Addressable
Yes
Table XXIII. SCON SFR Bit Designations
Bit
Name
Description
7
SM0
UART Serial Mode Select Bits.
6
SM1
These bits select the Serial Port operating mode as follows:
SM0
SM1
Selected Operating Mode
00
Mode 0: Shift Register, fixed baud rate (Core_Clk/2)
01
Mode 1: 8-bit UART, variable baud rate
10
Mode 2: 9-bit UART, fixed baud rate (Core_Clk/64) or (Core_Clk/32)
11
Mode 3: 9-bit UART, variable baud rate
5
SM2
Multiprocessor Communication Enable Bit.
Enables multiprocessor communication in Modes 2 and 3. In Mode 0, SM2 should be cleared.
In Mode 1, if SM2 is set, RI will not be activated if a valid stop bit was not received. If SM2 is set,
cleared, RI will be set as soon as the byte of data has been received. In Modes 2 or 3, if SM2 is
RI will not be activated if the received ninth data bit in RB8 is 0. If SM2 is cleared, RI will be set
as soon as the byte of data has been received.
4
REN
Serial Port Receive Enable Bit.
Set by user software to enable serial port reception.
Cleared by user software to disable serial port reception.
3TB8
Serial Port Transmit (Bit 9).
The data loaded into TB8 will be the ninth data bit that will be transmitted in Modes 2 and 3.
2
RB8
Serial Port Receiver Bit 9.
The ninth data bit received in Modes 2 and 3 is latched into RB8. For Mode 1 the stop bit is
latched into RB8.
1TI
Serial Port Transmit Interrupt Flag.
Set by hardware at the end of the eighth bit in Mode 0, or at the beginning of the stop bit in
Modes 1, 2, and 3. TI must be cleared by user software.
0RI
Serial Port Receive Interrupt Flag.
Set by hardware at the end of the eighth bit in mode 0, or halfway through the stop bit in
Modes 1, 2, and 3. RI must be cleared by software.
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