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ST9 数据表(PDF) 18 Page - STMicroelectronics |
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ST9 数据表(HTML) 18 Page - STMicroelectronics |
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18 / 146 page  18/146 ST9 USER GUIDE Figure 7. Selecting a 16-Register Working Group Using srp defines one group of sixteen working registers named r0 to r15, and occupying 16 contiguous registers in the register file. The lower case r for the register number indicates that it is a working register number, in contrast to upper case R registers that indicate an absolute register number. For example, accessing r3 is the same as accessing R19 if the current group is group 1: srp #2 ; Switch to group 1 inc r3 ; increment 4th register of the group Group F Paged Registers Group E System Registers R255 R240 R239 R224 R223 R00 R15 R16 R31 R32 Group 0 Groups 2 to D Register Pointer 0 (RP0R) R232 r15 r0 Group 1 as Working Register Group RP0R loaded using instruction code srp #2 General Purpose Registers |
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