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IA88C00-PDW48C-R 数据表(PDF) 24 Page - InnovASIC, Inc |
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IA88C00-PDW48C-R 数据表(HTML) 24 Page - InnovASIC, Inc |
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24 / 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 24 of 80 1.888.824.4184 Figure 15. Instruction Pointer High (IPH), R218 Bit 7 6 5 4 3 2 1 0 IP15 IP14 IP13 IP12 IP11 IP10 IP9 IPO8 Initial Value ? ? ? ? ? ? ? ? Read/Write R/W R/W R/W R/W R/W R/W R/W R/W A special register called the Instruction Pointer (IP) provides hardware support for threaded-code languages. It consists of register-pair R218-R219 and contains memory addresses. The MSB is R218. Threaded-code languages deal with an imaginary higher-level machine within the existing hardware machine. The IP acts like the PC for that machine. The command NEXT passes control to or from the hardware machine to the imaginary machine. And the commands ENTER and EXIT are imaginary machine equivalents of real machine CALLS and RETURNS. If the commands NEXT, ENTER and EXIT are not used, the IP can be used by the fast interrupt processing, as described in the interrupts section. Figure 16. Instruction Pointer Low (IPL), R219 Bit 7 6 5 4 3 2 1 0 IP7 IP6 IP5 IP4 IP3 IP2 IP1 IP0 Initial Value ? ? ? ? ? ? ? ? Read/Write R/W R/W R/W R/W R/W R/W R/W R/W A special register called the Instruction Pointer (IP) provides hardware support for threaded-code languages. This register consists of register pair R218-R219 and contains memory addresses. The MSB is R218. Threaded-code languages deal with an imaginary higher-level machine within the existing hardware machine. The IP acts like the PC for that machine. The command NEXT passes control to or from the hardware machine to the imaginary machine. And the commands ENTER and EXIT are imaginary machine equivalents of real machine CALLS and RETURNS. The IP can be used by the fast interrupt processing, as described in the interrupts section, if the commands NEXT, ENTER and EXIT are not used. Figure 17. Interrupt Mask (IRM), R221 Bit 7 6 5 4 3 2 1 0 Level 7 Level 7 Level 7 Level 7 Level 7 Level 7 Level 7 Level 7 Initial Value ? ? ? ? ? ? ? ? Read/Write R R R R R R R R |
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