參數(shù)資料
型號: AT89C5131A-RDTUM
廠商: Atmel
文件頁數(shù): 119/176頁
文件大?。?/td> 0K
描述: IC 8051 MCU FLASH 32K USB 64VQFP
產(chǎn)品培訓(xùn)模塊: MCU Product Line Introduction
標(biāo)準(zhǔn)包裝: 800
系列: AT89C513x
核心處理器: C52X2
芯體尺寸: 8-位
速度: 48MHz
連通性: I²C,SPI,UART/USART,USB
外圍設(shè)備: LED,POR,PWM,WDT
輸入/輸出數(shù): 34
程序存儲器容量: 32KB(32K x 8)
程序存儲器類型: 閃存
EEPROM 大小: 4K x 8
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-LQFP
包裝: 托盤
配用: AT89STK-10-ND - KIT EVAL APPL MASS STORAGE
AT89STK-05-ND - KIT STARTER FOR AT89C5131
46
AT89C5131
4136C–USB–04/05
On-chip Expanded
RAM (ERAM)
The AT89C5131 provides additional Bytes of random access memory (RAM) space for
increased data parameter handling and high level language usage.
AT89C5131 devices have expanded RAM in external data space; maximum size and
location are described in Table 45.
The AT89C5131 has on-chip data memory that is mapped into the following four sepa-
rate segments.
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 45)
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 22. Internal and External Data Memory Address
Table 45. Description of Expanded RAM
Part Number
ERAM Size
Address
Start
End
AT89C5131
1024
00h
3FFh
ERAM
Upper
128 bytes
Internal
RAM
Lower
128 bytes
Internal
RAM
Special
Function
Register
80h
00
0FFh or 3FFh
0FFh
00
0FFh
External
Data
Memory
0000
00FFh up to 03FFh
0FFFFh
indirect accesses
direct accesses
direct or indirect
accesses
7Fh
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