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IA88C00-PDW48C-R 数据表(PDF) 21 Page - InnovASIC, Inc |
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IA88C00-PDW48C-R 数据表(HTML) 21 Page - InnovASIC, Inc |
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21 / 80 page ![]() IA88C00 Data Sheet Microcontroller As of Production Version -01 Copyright © 2005 ENG 21 0 050519-00 www.Innovasic Innovasic.com Innovasic Semiconductor Page 21 of 80 1.888.824.4184 Figure 11. R214 (D6) RP0 Register Pointer 0 Bit 7 6 5 4 3 2 1 0 RP7 RP6 RP5 RP4 RP3 Not Used Not Used Not Used Initial Value 1 1 0 0 0 - - - Read/Write R/W R/W R/W R/W R/W - - - Register Pointer 0 (RP0) defines a moveable, 8-register section of the register space. The registers within these spaces are called working registers. RP0 is used in addressing modes where the register operand is expressed as a 4-bit address. At reset, RP0 points to R192. Figure 12. R215 (O7) RP1 Register Pointer 1 Bit 7 6 5 4 3 2 1 0 RP7 RP6 RP5 RP4 RP3 Not Used Not Used Not Used Initial Value ? ? ? ? ? ? ? ? Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Register Pointer 1 (RP1) defines a moveable, 8-register section of the register space. The registers within these spaces are called working registers. RP1 is used in addressing modes where the register operand is expressed as a 4-bit address. At reset, RP0 points to R200. Figure 13. R216 (D8) SPH Stack Pointer Bit 7 6 5 4 3 2 1 0 SP15 SP14 SP13 SP12 SP11 SP10 SP9 SP8 Initial Value Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Stack operations are supported in the register file or in data memory. Bit 1 in the external Memory Timing register (R254B0) selects between the two. Register pair R216-R217 forms the Stack Pointer used for all stack operations. R216 is the MSB and R217 is the LSB. |
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