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參數(shù)資料
| 型號： | TS80C51RD2-VIE |
| 廠商： | International Rectifier |
| 英文描述： | High Performance 8-bit Microcontroller |
| 中文描述： | 高性能8位微控制器 |
| 文件頁數(shù)： | 36/85頁 |
| 文件大?。?/td> | 762K |
| 代理商： | TS80C51RD2-VIE |
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36
4188E–8051–08/06
AT/TS8xC51Rx2
Slave C:SADDR1111 0010b
SADEN1111 1101b
Given1111 00X1b
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 communicate
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
).
6.4.4
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.:
SADDR0101 0110b
SADEN1111 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.
6.4.5
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.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TS83C51RB2-LCB | High Performance 8-bit Microcontroller |
| TS83C51RB2-LCE | High Performance 8-bit Microcontroller |
| TS83C51RB2-LIB | High Performance 8-bit Microcontroller |
| TS83C51RB2-LIE | High Performance 8-bit Microcontroller |
| TS83C51RB2-MCB | High Performance 8-bit Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TS80C51RD2-VIEB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| TS80C51RD2-VIED | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| TS80C51RD2-VIER | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Microcontroller |
| TS80C51RD2-VIL | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:High Performance 8-bit Microcontroller |
| TS80C51RD2-VILB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
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