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M30220MA-XXXGP Datasheet(PDF) 11 Page - Mitsubishi Electric Semiconductor |
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M30220MA-XXXGP Datasheet(HTML) 11 Page - Mitsubishi Electric Semiconductor |
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11 / 212 page  CPU Preliminary Specifications REV.E Specifications in this manual are tentative and subject to change. Mitsubishi microcomputers M30220 Group SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER 11 • Bit 7: Stack pointer select flag (U flag) Interrupt stack pointer (ISP) is selected when this flag is “0” ; user stack pointer (USP) is selected when this flag is “1”. This flag is cleared to “0” when a hardware interrupt is acknowledged or an INT instruction of software interrupt Nos. 0 to 31 is executed. • Bits 8 to 11: Reserved area • Bits 12 to 14: Processor interrupt priority level (IPL) Processor interrupt priority level (IPL) is configured with three bits, for specification of up to eight processor interrupt priority levels from level 0 to level 7. If a requested interrupt has priority greater than the processor interrupt priority level (IPL), the interrupt is enabled. • Bit 15: Reserved area The C, Z, S, and O flags are changed when instructions are executed. See the software manual for details. Figure 1.5.2. Flag register (FLG) Carry flag Debug flag Zero flag Sign flag Register bank select flag Overflow flag Interrupt enable flag Stack pointer select flag Reserved area Processor interrupt priority level Reserved area Flag register (FLG) C D Z S B O I U IPL b0 b15 |
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