參數(shù)資料
型號: T89C51AC2-SLSIM
廠商: Atmel
文件頁數(shù): 38/121頁
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44PLCC
標(biāo)準(zhǔn)包裝: 27
系列: 89C
核心處理器: 8051
芯體尺寸: 8-位
速度: 40MHz
連通性: UART/USART
外圍設(shè)備: 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: 2K x 8
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 44-LCC(J 形引線)
包裝: 管件
23
A/T89C51AC2
4127H–8051–02/08
Data Memory
The A/T89C51AC2 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
Lower
128 Bytes
Internal RAM
Special
Function
Registers
80h
00h
FFh
direct addressing
addressing
7Fh
direct or indirect
indirect addressing
256 up to 1024 Bytes
00h
64 KB
External XRAM
0000h
FFFFh
Internal XRAM
EXTRAM = 0
EXTRAM = 1
FFh or 3FFh
Internal
External
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