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參數(shù)資料
| 型號(hào)： | T89C51RD2-SMSCM |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| 中文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 15/104頁 |
| 文件大?。?/td> | 798K |
| 代理商： | T89C51RD2-SMSCM |
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15
T89C51RD2
4243G
–
8051
–
05/03
Expanded RAM (XRAM)
The T89C51RD2 provide additional Bytes of random access memory (RAM) space for
increased data parameter handling and high level language usage.
T89C51RD2 devices have expanded RAM in external data space; Maximum size and
location are described in Table 6.
The T89C51RD2 has internal data memory that 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
addressable only.
4. The expanded RAM bytes are indirectly accessed by MOVX instructions, and
with the EXTRAM bit cleared in the AUXR register. (See Table 7.)
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 separate from SFR space.
Figure 4.
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).
Table 6.
Description of Expanded RAM
Port
XRAM size
Address
Start
End
T89C51RD2
1024
00h
3FFh
XRAM
Upper
128 bytes
Internal
Ram
indirect accesses
Lower
128 bytes
Internal
Ram
direct or indirect
accesses
Special
Function
Register
direct accesses
80
80
00
FF or 3FF
FF
00
FF
External
Data
Memory
0000
0100 or 0400
FFFF
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| T89C51RD2-3CSCL | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-3CSCM | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-3CSIL | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-3CSIM | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-DDVCM | 0 to 40 MHz Flash Programmable 8-bit Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| T89C51RD2-SMSC-M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-SMSIL | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40 MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-SMSI-L | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
| T89C51RD2-SMSIM | 功能描述:IC MICRO CTRL 64K FLASH 68PLCC 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:9 系列:87C 核心處理器:8051 芯體尺寸:8-位 速度:40/20MHz 連通性:UART/USART 外圍設(shè)備:POR，WDT 輸入/輸出數(shù):32 程序存儲(chǔ)器容量:32KB（32K x 8） 程序存儲(chǔ)器類型:OTP EEPROM 大小:- RAM 容量:256 x 8 電壓 - 電源 (Vcc/Vdd):4.5 V ~ 5.5 V 數(shù)據(jù)轉(zhuǎn)換器:- 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 |
| T89C51RD2-SMSI-M | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:0 to 40MHz Flash Programmable 8-bit Microcontroller |
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