参数资料
型号: PIC16F526-I/MG
厂商: Microchip Technology
文件页数: 8/21页
文件大小: 0K
描述: MCU PIC 1.5K FLASH 3X3 16QFN
产品培训模块: 8-bit PIC® Microcontroller Portfolio
标准包装: 120
系列: PIC® 16F
核心处理器: PIC
芯体尺寸: 8-位
速度: 20MHz
外围设备: POR,WDT
输入/输出数: 11
程序存储器容量: 1.5KB(1K x 12)
程序存储器类型: 闪存
RAM 容量: 67 x 8
电压 - 电源 (Vcc/Vdd): 2 V ~ 5.5 V
数据转换器: A/D 3x8b
振荡器型: 内部
工作温度: -40°C ~ 85°C
封装/外壳: 16-VFQFN 裸露焊盘
包装: 托盘
产品目录页面: 638 (CN2011-ZH PDF)
17
6254C–ATARM–22-Jan-10
AT91SAM9XE128/256/512 Preliminary
7.2
Bus Matrix
6-layer Matrix, handling requests from 6 masters
Programmable Arbitration strategy
– Fixed-priority Arbitration
– Round-Robin Arbitration, either with no default master, last accessed default master
or fixed default master
Burst Management
– Breaking with Slot Cycle Limit Support
– Undefined Burst Length Support
One Address Decoder provided per Master
– Three different slaves may be assigned to each decoded memory area: one for
internal ROM boot, one for internal flash boot, one after remap
Boot Mode Select
– Non-volatile Boot Memory can be internal ROM or internal Flash
– Selection is made by General purpose NVM bit sampled at reset
Remap Command
– Allows Remapping of an Internal SRAM in Place of the Boot Non-Volatile Memory
(ROM or Flash)
– Allows Handling of Dynamic Exception Vectors
7.2.1
Matrix Masters
The Bus Matrix of the AT91SAM9XE128/256/512 manages six Masters, thus each master can
perform an access concurrently with others, depending on whether the slave it accesses is
available.
Each Master has its own decoder, which can be defined specifically for each master. In order to
simplify the addressing, all the masters have the same decodings.
7.2.2
Matrix Slaves
Each Slave has its own arbiter, thus allowing a different arbitration per Slave to be programmed.
Table 7-1.
List of Bus Matrix Masters
Master 0
ARM926 Instruction
Master 1
ARM926 Data
Master 2
Peripheral DMA Controller
Master 3
USB Host Controller
Master 4
Image Sensor Controller
Master 5
Ethernet MAC
Table 7-2.
List of Bus Matrix Slaves
Slave 0
Internal SRAM
Slave 1
Internal ROM
USB Host User Interface
Slave 2
External Bus Interface
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