參數(shù)資料
型號： P89LV51RC2BN
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
中文描述： 8-BIT, FLASH, 33 MHz, MICROCONTROLLER, PDIP40
封裝： 0.600 INCH, PLASTIC, MO-015, SOT-129-1, DIP-40
文件頁數(shù)： 40/77頁
文件大?。?/td> 349K
代理商： P89LV51RC2BN
Philips Semiconductors
P89LV51RB2/RC2/RD2
8-bit microcontrollers with 80C51 core
Product data
Rev. 04 — 02 December 2004
40 of 77
9397 750 14342
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
7.5.7
More about UART modes 2 and 3
Reception is performed in the same manner as in mode 1.
The signal to load SBUF and RB8, and to set RI, will be generated if, and only if, the
following conditions are met at the time the final shift pulse is generated: (a) RI = 0,
and (b) Either SM2 = 0, or the received 9th data bit =
1.
If either of these conditions is not met, the received frame is irretrievably lost, and RI
is not set. If both conditions are met, the received 9th data bit goes into RB8, and the
first 8 data bits go into SBUF.
7.5.8
Multiprocessor communications
UART modes 2 and 3 have a special provision for multiprocessor communications. In
these modes, 9 data bits are received or transmitted. When data is received, the 9th
bit is stored in RB8. The UART can be programmed so that when the stop bit is
received, the serial port interrupt will be activated only if RB8 =
1
. This feature is
enabled by setting bit SM2 in SCON. One way to use this feature in multiprocessor
systems is as follows:
When the master processor wants to transmit a block of data to one of several slaves,
it first sends out an address byte which identifies the target slave. An address byte
differs from a data byte in a way that the 9th bit is
‘1’
in an address byte and ‘0’ in the
data byte. With SM2 = 1, no slave will be interrupted by a data byte, i.e. the received
9th bit is ‘0’. However, an address byte having the 9th bit set to
‘1’
will interrupt all
slaves, so that each slave can examine the received byte and see if it is being
addressed or not. The addressed slave will clear its SM2 bit and prepare to receive
the data (still 9 bits long) that follow. The slaves that weren’t being addressed leave
their SM2 bits set and go on about their business, ignoring the subsequent data
bytes.
SM2 has no effect in Mode 0, and in Mode 1 can be used to check the validity of the
stop bit, although this is better done with the Framing Error flag. When UART receives
data in mode 1 and SM2 =
1
, the receive interrupt will not be activated unless a valid
stop bit is received.
7.5.9
Automatic address recognition
Automatic Address Recognition is a feature which allows the UART to recognize
certain addresses in the serial bit stream by using hardware to make the
comparisons. This feature saves a great deal of software overhead by eliminating the
need for the software to examine every serial address which passes by the serial
port. This feature is enabled for the UART by setting the SM2 bit in SCON. In the 9 bit
UART modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will be
automatically set when the received byte contains either the ‘Given’ address or the
‘Broadcast' address. The 9 bit mode requires that the 9th information bit is a
‘1’
to
indicate that the received information is an address and not data.
Using the Automatic Address Recognition feature allows a master to selectively
communicate with one or more slaves by invoking the Given slave address or
addresses. All of the slaves may be contacted by using the Broadcast address. Two
Special Function Registers are used to define the slave’s address, SADDR, and the
address mask, SADEN. SADEN is used to define which bits in the SADDR are to be
used and which bits are ‘don’t care’. The SADEN mask can be logically ANDed with
相關PDF資料
PDF描述
P89LV51RC2FA 8-bit 80C51 3 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RB2 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RB2BA 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RB2BBC 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
P89V51RC2 8-bit 80C51 5 V low power 16/32/64 kB Flash microcontroller with 1 kB RAM
相關代理商/技術參數(shù)
參數(shù)描述
P89LV51RC2BN,112 功能描述:8位微控制器 -MCU P89LV51RC2BN/DIP40/TUBE-BULK// RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
P89LV51RC2FA 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
P89LV51RC2FA,512 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
P89LV51RC2FBC 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 CLK ISP/IAP RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
P89LV51RC2FBC,557 功能描述:8位微控制器 -MCU 3V 16K/512 FL 12 RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風格:SMD/SMT
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