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M30220

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Mitsumi 

Unddeevrelopment

CPU

Tentative Specifications REV.E

Specifications in this manual are tentative and subject to change.

Mitsubishi microcomputers

M30220 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

• 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.

b15

IPL

b0

U I O B S Z D C 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

Figure 1.5.2. Flag register (FLG)

11

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