參數(shù)資料
型號(hào): T89C51SND1-ROTIL
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: Single Chip Microcontroller with MP3 Decoder and Man Machine Interface
中文描述: 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP80
封裝: TQFP-80
文件頁數(shù): 26/170頁
文件大?。?/td> 1927K
代理商: T89C51SND1-ROTIL
26
A/T89C51CC01
4129L–CAN–08/05
Data Memory
The T89C51CC01 provides data memory access in two different spaces:
1.
The internal space mapped in three separate segments:
the lower 128 Bytes RAM segment.
the upper 128 Bytes RAM segment.
the expanded 1024 Bytes RAM segment (XRAM).
2.
The external space.
A fourth internal segment is available but dedicated to Special Function Registers,
SFRs, (addresses 80h to FFh) accessible by direct addressing mode.
Figure 11 shows the internal and external data memory spaces organization.
Figure 10.
Internal Memory - RAM
Figure 11.
Internal and External Data Memory Organization XRAM-XRAM
Upper
128 Bytes
Internal RAM
indirect addressing
Lower
128 Bytes
Internal RAM
direct or indirect
Special
Function
Registers
direct addressing
80h
7Fh
80h
00h
FFh
FFh
addressing
256 up to 1024 Bytes
Internal XRAM
EXTRAM = 0
00h
64K Bytes
External XRAM
0000h
FFFFh
EXTRAM = 1
FFh or 3FFh
Internal
External
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