參數(shù)資料
型號： AT90S8515A-8PC
廠商： Atmel
文件頁數(shù)： 52/112頁
文件大小： 0K
描述： IC MCU 8K FLSH 8MHZ 40DIP
標準包裝： 18
系列： AVR® 90S
核心處理器： AVR
芯體尺寸： 8-位
速度： 8MHz
連通性： SPI，UART/USART
外圍設備： 欠壓檢測/復位，POR，PWM，WDT
輸入/輸出數(shù)： 32
程序存儲器容量： 8KB（4K x 16）
程序存儲器類型： 閃存
EEPROM 大小： 512 x 8
RAM 容量： 512 x 8
電壓 - 電源 (Vcc/Vdd)： 4 V ~ 6 V
振蕩器型： 內(nèi)部
工作溫度： 0°C ~ 70°C
封裝/外殼： 40-DIP（0.600"，15.24mm）
包裝： 管件
44
AT90S8515
0841G–09/01
EEPROM Read/Write
Access
The EEPROM access registers are accessible in the I/O space.
The write access time is in the range of 2.5 - 4 ms, depending on the V
CC voltages. A
self-timing function, however, lets the user software detect when the next byte can be
written. If the user code contains code that writes the EEPROM, some precaution must
be taken. In heavily filtered power supplies, V
CC is likely to rise or fall slowly on power-
up/down. This causes the device for some period of time to run at a voltage lower than
specified as minimum for the clock frequency used. CPU operation under these condi-
tions is likely cause the program counter to perform unintentional jumps and eventually
execute the EEPROM write code. To secure EEPROM integrity, the user is advised to
use an external under-voltage reset circuit in this case.
In order to prevent unintentional EEPROM writes, a specific write procedure must be fol-
lowed. Refer to the description of the EEPROM Control Register for details on this.
When the EEPROM is written, the CPU is halted for two clock cycles before the next
instruction is executed. When the EEPROM is read, the CPU is halted for four clock
cycles before the next instruction is executed.
EEPROM Address Register –
EEARH and EEARL
The EEPROM address registers (EEARH and EEARL) specify the EEPROM address in
the 512-byte EEPROM space for AT90S8515. The EEPROM data bytes are addressed
linearly between 0 and 512.
EEPROM Data Register –
EEDR
Bits 7..0 – EEDR7..0: EEPROM Data
For the EEPROM write operation, the EEDR register contains the data to be written to
the EEPROM in the address given by the EEAR register. For the EEPROM read opera-
tion, the EEDR contains the data read out from the EEPROM at the address given by
EEAR.
EEPROM Control Register –
EECR
Bits 7..3 – Res: Reserved Bits
These bits are reserved bits in the AT90S8515 and will always read as zero.
Bit
1514
13
1211
10
9
8
$1F ($3F)
–––
–
EEAR8
EEARH
$1E ($3E)
EEAR7
EEAR6
EEAR5
EEAR4
EEAR3
EEAR2
EEAR1
EEAR0
EEARL
765
432
10
Read/Write
RR
RRR
RR
R/W
Initial Value
0
000
00
Bit
765
432
10
$1D ($3D)
MSB
LSB
EEDR
Read/Write
R/W
Initial Value
0
Bit
7
65
43
2
1
0
$1C ($3C)
–
EEMWE
EEWE
EERE
EECR
Read/Write
R
R/W
Initial Value
0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AT90S8515A-8PI 功能描述:IC MCU 8BIT 8KB FLASH 40DIP 制造商:microchip technology 系列:AVR? 90S 包裝:管件 零件狀態(tài):停產(chǎn) 核心處理器:AVR 核心尺寸:8-位 速度:8MHz 連接性:SPI，UART/USART 外設:欠壓檢測/復位，POR，PWM，WDT I/O 數(shù):32 程序存儲容量:8KB（4K x 16） 程序存儲器類型:閃存 EEPROM 容量:512 x 8 RAM 容量:512 x 8 電壓 - 電源（Vcc/Vdd）:4 V ~ 6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器類型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:40-DIP（0.600"，15.24mm） 供應商器件封裝:40-PDIP 基本零件編號:AT90S8515 標準包裝:18
AT90S8515-JC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
AT90S8515-JI 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
AT90S8515-PC 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
AT90S8515-PI 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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