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參數(shù)資料
| 型號： | AT80C31X2-SLSUL |
| 廠商： | Atmel |
| 文件頁數(shù)： | 5/42頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC 8031 MCU ROMLESS 44PLCC |
| 標(biāo)準(zhǔn)包裝： | 972 |
| 系列： | 80C |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 30/20MHz |
| 連通性： | UART/USART |
| 外圍設(shè)備： | POR |
| 輸入/輸出數(shù)： | 32 |
| 程序存儲器類型： | ROMless |
| RAM 容量： | 128 x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 包裝： | 管件 |
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13
4428E–8051–02/08
AT/TS80C31X2
Slave C:
SADDR
1111 0010b
SADEN
1111 1101b
Given
1111 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).
9.4
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.:
SADDR
0101 0110b
SADEN
1111 1100b
Broadcast =SADDR OR SADEN
1111 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:
SADDR
1111 0001b
SADEN
1111 1010b
Broadcast
1111 1X11b,
Slave B:
SADDR
1111 0011b
SADEN
1111 1001b
Broadcast
1111 1X11B,
Slave C:
SADDR=
1111 0010b
SADEN
1111 1101b
Broadcast
1111 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.
9.5
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.
Reset Value = 0000 0000b
Not bit addressable
Table 9-1.
SADEN - Slave Address Mask Register (B9h)
7
6
5
4
3
2
1
0
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| AT80C31X2-RLTUM | IC 8031 MCU ROMLESS 44VQFP |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT80C31X2-SLSUM | 功能描述:8位微控制器 -MCU MICRO RLESS 31X2 40MHZ 5V C. 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(fēng)格:SMD/SMT |
| AT80C31X2-SLSUV | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit CMOS Microcontroller ROMless |
| AT80C32-12 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| AT80C32-12R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller |
| AT80C32-16 | 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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