參數(shù)資料
型號(hào): PSD501B1
英文描述: Field Programmable Microcontroller Peripherals(可編程邏輯,16K位SRAM,40個(gè)可編程I/O,通用PLD有61個(gè)輸入)
中文描述: 現(xiàn)場(chǎng)可編程微控制器外圍設(shè)備(可編程邏輯,16K的位的SRAM,40余個(gè)可編程輸入/輸出,通用PLD的有61個(gè)輸入)
文件頁數(shù): 52/130頁
文件大?。?/td> 704K
代理商: PSD501B1
PSD5XX Famly
6-52
Memory Select Map For 8031 Application
The 8031 family of microcontrollers has separate code memory space and data memory
space. This feature requires a different Memory Select Map. Two modes of operation are
provided for 8031 applications. The selection of the modes is specified in the PSD5XX
PSDsoft Software (PSDconfiguration):
J
Separate Space Mode
In this mode, the PSEN signal is used to access code from EPROM, and the RD signal
is used to access data from SRAM. The code memory space is separated from the data
memory space.
J
Combined Space Mode
In this mode, the EPROM can be accessed by PSEN or RD. The EPROM is used for
code and data storage. The memory block's address space cannot overlap.
If data and code memory blocks must overlap each other, the RD signal can be included as
an additional address input in generating the EPROM chip select signals (ES0 – ES3). In
this case the EPROM access time is from the RD valid to data valid. Figures 26a and 26b
show the memory configuration in the two modes.
In some applications it is desirable to execute program codes in SRAM. The PSD5XX
provides this option by enabling PSEN to access SRAM. To activate this option, the
SRCODE bit of the VM Register must be set to “1” (see Table 16). SRAM space can
overlap EPROM space and has priority when PSEN is used.
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
*
*
*
*
*
*
SRCODE
PIO
1 = ON
1 = ON
*
= Reserved for future use, bits set to zero.
Table 16. VM Register
Memory
Block
(Cont.)
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