參數(shù)資料
型號(hào)： SAK-C164CH-8FM
廠(chǎng)商： INFINEON TECHNOLOGIES AG
元件分類(lèi)： 微控制器/微處理器
英文描述： 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP80
封裝： 0.65 MM PITCH, METRIC, PLASTIC, QFP-80
文件頁(yè)數(shù)： 7/74頁(yè)
文件大小： 917K
代理商： SAK-C164CH-8FM
&
Data Sheet
13
1999-08
External Bus Controller
All of the external memory accesses are performed by a particular on-chip External Bus
Controller (EBC). It can be programmed either to Single Chip Mode when no external
memory is required, or to one of four different external memory access modes, which are
as follows:
– 16-/18-/20-/22-bit Addresses, 16-bit Data, Demultiplexed
– 16-/18-/20-/22-bit Addresses, 16-bit Data, Multiplexed
– 16-/18-/20-/22-bit Addresses, 8-bit Data, Multiplexed
– 16-/18-/20-/22-bit Addresses, 8-bit Data, Demultiplexed
In the demultiplexed bus modes, addresses are output on PORT1 and data is input/
output on PORT0 or P0L, respectively. In the multiplexed bus modes both addresses
and data use PORT0 for input/output.
Important timing characteristics of the external bus interface (Memory Cycle Time,
Memory Tri-State Time, Length of ALE and Read Write Delay) have been made
programmable to allow the user the adaption of a wide range of different types of
memories and external peripherals.
In addition, up to 4 independent address windows may be defined (via register pairs
ADDRSELx / BUSCONx) which allow to access different resources with different bus
characteristics. These address windows are arranged hierarchically where BUSCON4
overrides BUSCON3 and BUSCON2 overrides BUSCON1. All accesses to locations not
covered by these 4 address windows are controlled by BUSCON0.
Up to 4 external CS signals (3 windows plus default) can be generated in order to save
external glue logic. The C164 offers the possibility to switch the CS outputs to an
unlatched mode. In this mode the internal filter logic is switched off and the CS signals
are directly generated from the address. The unlatched CS mode is enabled by setting
CSCFG (SYSCON.6).
For applications which require less than 4 MBytes of external memory space, this
address space can be restricted to 1 MByte, 256 KByte or to 64 KByte. In this case Port 4
outputs four, two, or no address lines at all. It outputs all 6 address lines, if an address
space of 4 MBytes is used.
Note: When the on-chip CAN Module is activated on Port 4 the segment address output
is limited to 4 bits (i.e. A19...A16) due to the CAN interface pins.
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參數(shù)描述
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SAKC164CI8E25M DB 制造商:Infineon Technologies AG 功能描述:
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SAKC164CI8E25M DB TR 制造商:Infineon Technologies AG 功能描述:
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