參數(shù)資料
型號(hào)： SST89E54RC-33-C-NJE
廠商： Microchip Technology
文件頁數(shù)： 33/71頁
文件大?。?/td> 0K
描述： IC MCU 8BIT 17KB FLASH 44PLCC
標(biāo)準(zhǔn)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(shè)備： POR，WDT
輸入/輸出數(shù)： 32
程序存儲(chǔ)器容量： 16KB（16K x 8）
程序存儲(chǔ)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
39
FlashFlex MCU
SST89E52RC / SST89E54RC
Data Sheet
A Microchip Technology Company
Automatic Address Recognition
Automatic Address Recognition helps to reduce the MCU time and power required to talk to multiple
serial devices. Each device is hooked together sharing the same serial link with its own address. In this
configuration, a device is only interrupted when it receives its own address, thus eliminating the soft-
ware overhead to compare addresses.
This same feature helps to save power because it can be used in conjunction with idle mode to reduce
the system’s overall power consumption. Since there may be multiple slaves hooked up serial to one
master, only one slave would have to be interrupted from idle mode to respond to the master’s trans-
mission. Automatic Address Recognition (AAR) allows the other slaves to remain in idle mode while
only one is interrupted. By limiting the number of interruptions, the total current draw on the system is
reduced.
There are two ways to communicate with slaves: a group of them at once, or all of them at once. To
communicate with a group of slaves, the master sends out an address called the given address. To
communicate with all the slaves, the master sends out an address called the “broadcast” address.
AAR can be configured as mode 2 or 3 (9-bit modes) and setting the SM2 bit in SCON. Each slave has
its own SM2 bit set waiting for an address byte (9th bit = 1). The Receive Interrupt (RI) flag will only be
set when the received byte matches either the given address or the broadcast address. Next, the slave
then clears its SM2 bit to enable reception of the data bytes (9th bit = 0) from the master. When the 9th
bit = 1, the master is sending an address. When the 9th bit = 0, the master is sending actual data.
If mode 1 is used, the stop bit takes the place of the 9th bit. Bit RI is set only when the received com-
mand frame address matches the device’s address and is terminated by a valid stop bit. Note that
mode 0 cannot be used. Setting SM2 bit in the SCON register in mode 0 will have no effect.
Each slave’s individual address is specified by SFR SADDR. SFR SADEN is a mask byte that defines
“don’t care” bits to form the given address when combined with SADDR. See the example below:
Slave 1
SADDR
=
1111 0001
SADEN
=
1111 1010
GIVEN
=
1111 0X0X
Slave 2
SADDR
=
1111 0011
SADEN
=
1111 1001
GIVEN
=
1111 0XX1
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SST89E54RC-33-C-PIE 功能描述:8位微控制器 -MCU 8-Bit 16K+1K Flash 33MHz 3/16-Bit Timer 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(shí)鐘頻率:50 MHz 程序存儲(chǔ)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
SST89E54RD 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex MCU
SST89E54RD2 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
SST89E54RD2/RD 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
SST89E54RD2-33-C-NI 制造商:SST 制造商全稱:Silicon Storage Technology, Inc 功能描述:FlashFlex51 MCU
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