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ST9291N5 bảng dữ liệu(PDF) 9 Page - STMicroelectronics |
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ST9291N5 bảng dữ liệu(HTML) 9 Page - STMicroelectronics |
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9 / 20 page  1.1.2.2 Addressing Registers All registers in the Register File and pages can be specified by using a decimal, hex or binary ad- dress, e.g. R231, RE7h or R11100111b is the same register. The registers can be referred to by their hexadeci- mal group address, so that registers R0-R15 form group 0, R160-R175 form group A and so on. Working Register Addresses The 8-bit register address is formed by 2 nibbles, for example, for register R195 or RC3h or R11000011, 1100 specifies the 13th group (i.e. group C) and 0011 specifies the 3rd register in that group. Working registers are addressed by supplying the least significant nibble in the instruction and adding it to the most significant nibble found in the Regis- ter Pointer (R233). Working register addressing is shown in Figure 1-7. System Registers The 16 system registers at addresses R224 to R239 form Group E. The system registers are addressable using any of the 4 register addressing modes and the most sig- nificant nibble will, in all cases, be 14 (0Eh). Paged Registers There are a maximum of 64 pages each containing 16 registers. These are addressed using the regis- ter addressing modes with the addition of the Page Pointer register, R234. This register selects the page to be addressed in group F and once set, does not need to be changed if two or more regis- ters on the same page are to be addressed in suc- cession. Therefore if the Page Pointer, R234, is set to 5, the instructions spp 5 ld R242, r4 will load the contents of working register r4 into the third register (R242) of page 5. These paged registers hold data and control regis- ters related to the on-chip peripherals, and thus the configuration depends upon the peripheral organi- sation of each ST9 family member. i.e. pages only exist if the peripheral exists. Available pages are shown in Table 1-3. 1.1.2.3 Input/Output Ports The Input/Output ports are located in two areas. The port registers for Ports 0-5 are located at the bottom of the System register group in locations R224 to R229. Each Port has three associated Control registers, which determine the individual pin modes (I/O, Open-Drain etc). These registers are located in pages 2 and 3. ADDRESS SPACES (Continued) Hex. Address Decimal Address Function Register File Group F0-FF 240-255 Paged Registers Group F E0-EF 224-239 System Registers Group E D0-DF 208-223 General Purpose Registers Group D C0-CF 192-207 Group C B0-BF 176-191 Group B A0-AF 160-175 Group A 90-9F 144-159 Group 9 80-8F 128-143 Group 8 70-7F 112-127 Group 7 60-6F 96-111 Group 6 50-5F 80-95 Group 5 40-4F 64-79 Group 4 30-3F 48-63 Group 3 20-2F 32-47 Group 2 10-1F 16-31 Group 1 00-0F 00-15 Group 0 Table 1-2. Register File Organization ® ST9291 9/20 |
Số phần tương tự - ST9291N5 |
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Mô tả tương tự - ST9291N5 |
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