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參數(shù)資料
| 型號(hào)： | AT89C51ED2-SMSUM |
| 廠商： | Atmel |
| 文件頁(yè)數(shù)： | 54/137頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC 8051 MCU FLASH 64K 68PLCC |
| 產(chǎn)品培訓(xùn)模塊： | MCU Product Line Introduction |
| 標(biāo)準(zhǔn)包裝： | 304 |
| 系列： | 89C |
| 核心處理器： | 8051 |
| 芯體尺寸： | 8-位 |
| 速度： | 60MHz |
| 連通性： | SPI，UART/USART |
| 外圍設(shè)備： | POR，PWM，WDT |
| 輸入/輸出數(shù)： | 50 |
| 程序存儲(chǔ)器容量： | 64KB（64K x 8） |
| 程序存儲(chǔ)器類型： | 閃存 |
| EEPROM 大?。?/td> | 2K x 8 |
| RAM 容量： | 2K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 振蕩器型： | 外部 |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 68-PLCC |
| 包裝： | 管件 |
| 配用： | AT89OCD-01-ND - USB EMULATOR FOR AT8XC51 MCU |
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23
4235K–8051–05/08
AT89C51RD2/ED2
9.
Expanded RAM (XRAM)
The AT89C51RD2/ED2 provides additional on-chip random access memory (RAM) space for
increased data parameter handling and high level language usage.
AT89C51RD2/ED2 device haS expanded RAM in external data space configurable up to 1792
bytes (see Table 9-1).
The AT89C51RD2/ED2 internal data memory is mapped into four separate segments.
The four segments are:
1.
The Lower 128 bytes of RAM (addresses 00h to 7Fh) are directly and indirectly
addressable.
2.
The Upper 128 bytes of RAM (addresses 80h to FFh) are indirectly addressable only.
3.
The Special Function Registers, SFRs, (addresses 80h to FFh) are directly address-
able only.
4.
The expanded RAM bytes are indirectly accessed by MOVX instructions, and with the
EXTRAM bit cleared in the AUXR register (see Table 9-1).
The lower 128 bytes can be accessed by either direct or indirect addressing. The Upper 128
bytes can be accessed by indirect addressing only. The Upper 128 bytes occupy the same
address space as the SFR. That means they have the same address, but are physically sepa-
rate from SFR space.
Figure 9-1.
Internal and External Data Memory Address
When an instruction accesses an internal location above address 7Fh, the CPU knows whether
the access is to the upper 128 bytes of data RAM or to SFR space by the addressing mode used
in the instruction.
Instructions that use direct addressing access SFR space. For example: MOV 0A0H, # data,
accesses the SFR at location 0A0h (which is P2).
Instructions that use indirect addressing access the Upper 128 bytes of data RAM. For
example: MOV @R0, # data where R0 contains 0A0h, accesses the data byte at address
0A0h, rather than P2 (whose address is 0A0h).
The XRAM bytes can be accessed by indirect addressing, with EXTRAM bit cleared and
MOVX instructions. This part of memory which is physically located on-chip, logically
occupies the first bytes of external data memory. The bits XRS0 and XRS1 are used to hide a
XRAM
Upper
128 Bytes
Internal
RAM
Lower
128 Bytes
Internal
RAM
Special
Function
Register
80h
00
0FFh or 6FFh
0FFh
00
0FFh
External
Data
Memory
0000
00FFh up to 06FFh
0FFFFh
Indirect Accesses
Direct Accesses
Direct or Indirect
Accesses
7Fh
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| AT89C51ED2-UM | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:8-bit Flash Microcontroller |
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| AT89C51IC2-RLRIL | 功能描述:IC MCU FLASH 8051 32K 3V 44-VQFP RoHS:否 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:89C 標(biāo)準(zhǔn)包裝:1 系列:AVR® ATmega 核心處理器:AVR 芯體尺寸:8-位 速度:16MHz 連通性:I²C，SPI，UART/USART 外圍設(shè)備:欠壓檢測(cè)/復(fù)位，POR，PWM，WDT 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:32KB（16K x 16） 程序存儲(chǔ)器類型:閃存 EEPROM 大小:1K x 8 RAM 容量:2K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 125°C 封裝/外殼:44-TQFP 包裝:剪切帶 (CT) 其它名稱:ATMEGA324P-B15AZCT |
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