7220 datasheet(53/303 Pages) RENESAS

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2-26

7220 Group User’s Manual

FUNCTIONAL DESCRIPTION

2.5 Interrupts

Interrupts are used in the following cases.

q When there is a request to execute a higher priority routine than current processing routine.

q When it is necessary to process according to a certain timing.

The M37221M6-XXXSP/FP has 14 interrupt sources (including reset).

These are vector interrupts with a fixed priority sequence. Table 2.5.1 shows the interrupt sources, vector

addresses and the interrupt priority sequence.

M37220M3-XXXSP/FP

Refer to “CHAPTER 4. M37220M3-XXXSP/FP.”

Note: Reset are included in the table because it operates in the same way as interrupts.

These 14-source, 14-vector interrupts have the priority sequence as shown in Table 2.5.1 (reset has a

higher priority than interrupts).

When two or more interrupt requests occur at the same sampling point, the interrupt with the higher priority

(in order of 1 to 14) is received. This priority sequence is determined by hardware, but priority processing

is possible to be varied by software, by using the interrupt enable bit and the interrupt disable flag.

Table 2.5.1 Interrupt sources, vector addresses and priority

Reset (Note)

CRT interrupt

INT2 interrupt

INT1 interrupt

Timer 4 interrupt

f(XIN)/4096 interrupt

VSYNC interrupt

Timer 3 interrupt

Timer 2 interrupt

Timer 1 interrupt

Serial I/O interrupt

Multi-master I2C-BUS interface interrupt

INT3 interrupt

BRK instruction interrupt

High-order byte

FFFF16

FFFD16

FFFB16

FFF916

FFF516

FFF316

FFF116

FFEF16

FFED16

FFEB16

FFE916

FFE716

FFE516

FFDF16

Low-order byte

FFFE16

FFFC16

FFFA16

FFF816

FFF416

FFF216

FFF016

FFEE16

FFEC16

FFEA16

FFE816

FFE616

FFE416

FFDE16

Vector addresses

Non-maskable

Active edge selectable

Non-maskable (software interrupt)

Priority

Interrupt sources

Remarks

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