參數(shù)資料
型號: SST89E54RC-33-C-NJE
廠商: Microchip Technology
文件頁數(shù): 35/71頁
文件大?。?/td> 0K
描述: IC MCU 8BIT 17KB FLASH 44PLCC
標準包裝: 26
系列: FlashFlex®
核心處理器: 8051
芯體尺寸: 8-位
速度: 33MHz
連通性: EBI/EMI,UART/USART
外圍設備: POR,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
EEPROM 大?。?/td> 1K x 8
RAM 容量: 512 x 8
電壓 - 電源 (Vcc/Vdd): 4.5 V ~ 5.5 V
振蕩器型: 外部
工作溫度: 0°C ~ 70°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
2011 Silicon Storage Technology, Inc.
DS25088A
10/11
40
FlashFlex MCU
SST89E52RC / SST89E54RC
Data Sheet
A Microchip Technology Company
Using the Given Address to Select Slaves
Any bits masked off by a 0 from SADEN become a “don’t care” bit for the given address. Any bit
masked off by a 1, becomes ANDED with SADDR. The “don’t cares” provide flexibility in the user-
defined addresses to address more slaves when using the given address.
Shown in the example above, Slave 1 has been given an address of 1111 0001 (SADDR). The SADEN
byte has been used to mask off bits to a given address to allow more combinations of selecting Slave 1
and Slave 2. In this case for the given addresses, the last bit (LSB) of Slave 1 is a “don’t care” and the
last bit of Slave 2 is a 1. To communicate with Slave 1 and Slave 2, the master would need to send an
address with the last bit equal to 1 (e.g. 1111 0001) since Slave 1’s last bit is a don’t care and Slave 2’s
last bit has to be a 1. To communicate with Slave 1 alone, the master would send an address with the
last bit equal to 0 (e.g. 1111 0000), since Slave 2’s last bit is a 1. See the table below for other possible
combinations.
If the user added a third slave such as the example below:
Select Slave 1 Only
Slave 1
Given Address
Possible Addresses
1111 0X0X
1111 0000
1111 0100
Select Slave 2 Only
Slave 2
Given Address
Possible Addresses
1111 0XX1
1111 0111
1111 0011
Select Slaves 1 and 2
Slaves 1 and 2
Possible Addresses
1111 0001
1111 0101
Slave 3
SADDR =
1111
1001
SADEN =
1111
0101
GIVEN
=
1111 X0X1
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