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参数资料
型号： AT87C5112
厂商： Atmel Corp.
英文描述： 8-bit Microcontroller with A/D Converter
中文描述： 8位微控制器与A / D转换器
文件页数： 29/97页
文件大小： 1229K
代理商： AT87C5112
29
AT8xC5112
4191B
–
8051
–
04/03
The SADEN byte is selected so that each slave may be addressed separately.
For slave A, bit 0 (the LSB) is a don
’
t-care bit; for slaves B and C, bit 0 is a 1. To com-
municate with slave A only, the master must send an address where bit 0 is clear (e.g.
1111 0000b
).
For slave A, bit 1 is a 1; for slaves B and C, bit 1 is a don
’
t care bit. To communicate with
slaves B and C, but not slave A, the master must send an address with bits 0 and 1 both
set (e.g.
1111 0011b
).
To communicate with slaves A, B and C, the master must send an address with bit 0
set, bit 1 clear, and bit 2 clear (e.g.
1111 0001b
).
Broadcast Address
A broadcast address is formed from the logical OR of the SADDR and SADEN registers
with zeros defined as don
’
t-care bits, e.g.:
SADDR 0101 0110b
SADEN 1111 1100b
Broadcast =SADDR OR SADEN1111 111Xb
The use of don
’
t-care bits provides flexibility in defining the broadcast address, however
in most applications, a broadcast address is FFh. The following is an example of using
broadcast addresses:
Slave A:SADDR1111 0001b
SADEN1111 1010b
Broadcast1111 1X11b,
Slave B:SADDR1111 0011b
SADEN1111 1001b
Broadcast1111 1X11B,
Slave C:SADDR=1111 0010b
SADEN1111 1101b
Broadcast1111 1111b
For slaves A and B, bit 2 is a don
’
t care bit; for slave C, bit 2 is set. To communicate with
all of the slaves, the master must send an address FFh. To communicate with slaves A
and B, but not slave C, the master can send and address FBh.
Reset Addresses
On reset, the SADDR and SADEN registers are initialized to 00h, i.e. the given and
broadcast addresses are
XXXX XXXXb
(all don
’
t-care bits). This ensures that the serial
port will reply to any address, and so, that it is backwards compatible with the 80C51
microcontrollers that do not support automatic address recognition.
Baud Rate Selection for
UART for mode 1 and 3
The Baud Rate Generator for transmit and receive clocks can be selected separately via
the T2CON and BDRCON registers.
相关PDF资料
PDF描述
AT80C51RB2-3CSCM 80C51 High Performance ROM 8-bit Microcontroller
AT80C51RB2-3CSIM 80C51 High Performance ROM 8-bit Microcontroller
AT80C51RB2-3CSUM 80C51 High Performance ROM 8-bit Microcontroller
AT80C51RB2-RLTIL 80C51 High Performance ROM 8-bit Microcontroller
AT80C51RB2-RLTIM 80C51 High Performance ROM 8-bit Microcontroller
相关代理商/技术参数
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AT87C51RB2 制造商:IRF 制造商全称:International Rectifier 功能描述:High Performance 8-bit Microcontroller
AT87C51RB2-3CSUL 功能描述:8位微控制器 -MCU OTP RB/16K 40MHZ 3V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT87C51RB2-3CSUM 功能描述:8位微控制器 -MCU 32KB SCMOS 3/2 .5 OTP RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT87C51RB2-RLRUM 功能描述:8位微控制器 -MCU 32KB 2.5u RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
AT87C51RB2-RLTUL 功能描述:8位微控制器 -MCU OTP RB/16K 40MHZ 3V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
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