參數(shù)資料
型號(hào): T89C51SND1-ROTIL
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: Single Chip Microcontroller with MP3 Decoder and Man Machine Interface
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP80
封裝: TQFP-80
文件頁數(shù): 56/170頁
文件大?。?/td> 1927K
代理商: T89C51SND1-ROTIL
56
A/T89C51CC01
4129L–CAN–08/05
Figure 29.
UART Timing in Mode 1
Figure 30.
UART Timing in Modes 2 and 3
Automatic Address
Recognition
The automatic address recognition feature is enabled when the multiprocessor commu-
nication feature is enabled (SM2 bit in SCON register is set).
Implemented in the hardware, automatic address recognition enhances the multiproces-
sor communication feature by allowing the serial port to examine the address of each
incoming command frame. Only when the serial port recognizes its own address will the
receiver set the RI bit in the SCON register to generate an interrupt. This ensures that
the CPU is not interrupted by command frames addressed to other devices.
If necessary, you can enable the automatic address recognition feature in mode 1. In
this configuration, the stop bit takes the place of the ninth data bit. Bit RI is set only when
the received command frame address matches the device’s address and is terminated
by a valid stop bit.
To support automatic address recognition, a device is identified by a given address and
a broadcast address.
Note:
The multiprocessor communication and automatic address recognition features cannot
be enabled in mode 0 (i.e. setting SM2 bit in SCON register in mode 0 has no effect).
Data byte
RI
SMOD0=X
Stop
bit
Start
bit
RXD
D7
D6
D5
D4
D3
D2
D1
D0
FE
SMOD0=1
RI
SMOD0=0
Data byte
Ninth
bit
Stop
bit
Start
bit
RXD
D8
D7
D6
D5
D4
D3
D2
D1
D0
RI
SMOD0=1
FE
SMOD0=1
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