参数资料
型号: T89C51AC2-RLTIM
厂商: Atmel
文件页数: 38/121页
文件大小: 0K
描述: IC 8051 MCU FLASH 32K 44VQFP
标准包装: 160
系列: 89C
核心处理器: 8051
芯体尺寸: 8-位
速度: 40MHz
连通性: UART/USART
外围设备: POR,PWM,WDT
输入/输出数: 34
程序存储器容量: 32KB(32K x 8)
程序存储器类型: 闪存
EEPROM 大小: 2K x 8
RAM 容量: 1.25K x 8
电压 - 电源 (Vcc/Vdd): 3 V ~ 5.5 V
数据转换器: A/D 8x10b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 44-LQFP
包装: 托盘
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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