参数资料
型号: ST92186B3BK
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封装: PLASTIC, SDIP-32
文件页数: 79/148页
文件大小: 1664K
代理商: ST92186B3BK
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ST92186B - DEVICE ARCHITECTURE
ADDRESS SPACE EXTENSION (Cont’d)
2.6.2 Addressing 64-Kbyte Segments
This extension mode is used to address Program
memory space during any code execution (normal
code and interrupt routines).
Two registers are used: CSR and ISR. The 6-bit
contents of one of the registers CSR or ISR define
one out of 64 Memory segments of 64 Kbytes with-
in the 4 Mbytes address space. The register con-
tents represent the 6 MSBs of the memory ad-
dress, whereas the 16 LSBs of the address (intra-
segment address) are given by the virtual 16-bit
address (see Figure 16).
2.7 MMU REGISTERS
The MMU uses 7 registers mapped into Group F,
Page 21 of the Register File and 2 bits of the
EMR2 register.
Most of these registers do not have a default value
after reset.
2.7.1 DPR[3:0]: Data Page Registers
The DPR[3:0] registers allow access to the entire 4
Mbyte memory space composed of 256 pages of
16 Kbytes.
2.7.1.1 Data Page Register Relocation
If these registers are to be used frequently, they
may be relocated in register group E, by program-
ming bit 5 of the EMR2-R246 register in page 21. If
this bit is set, the DPR[3:0] registers are located at
R224-227 in place of the Port 0-3 Data Registers,
which are re-mapped to the default DPR's loca-
tions: R240-243 page 21.
Data Page Register relocation is illustrated in Fig-
ure 14.
Figure 16. Addressing via CSR and ISR
Fetching program
Fetching interrupt
instruction
16-bit virtual address
22-bit physical address
6 bits
MMU registers
CSR
ISR
1
2
1
2
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