TMPR4938 datasheet(472/716 Pages) TOSHIBA

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Chapter 15 Interrupt Controller

15-8

15.3.7 Interrupt requests

It is possible to make interrupt requests to external devices and interrupt requests (IRC interrupts) to

the TX49/H3 core by using a 16-bit interrupt request flag register. REQ[1]* signals are used as interrupt

output signals. Consequently, external interrupt requests can only be used when in the PCI External

Arbiter mode. Also, internal interrupt requests are assigned to interrupt number 13 of the Interrupt

Controller (IRC).

The following six registers set the interrupts.

•

Interrupt Request Flag Register (IRFLAG0, IRFLAG1)

•

Interrupt Request Polarity Control Register (IRPOL)

•

Interrupt Request Mask Register (IRMASKINT, IRMASKEXT)

•

Interrupt Request Control Register (IRRCNT)

The following formulas derive the interrupt generation conditions:

Internal interrupt request =

(|((IRFLAG[15:0] ^ IRPOL[15:0]) & IRMASKINT[15:0]))^ IRRCNT.INTPOL

External interrupt request =

(|((IRFLAG[15:0] ^ IRPOL[15:0] ) & IRMASKEXT[15:0]))^ IRRCNT.EXTPOL

In the above formulas, “^” indicates Exclusive OR operations and “|” indicates reduction operators

that perform an OR operation on all bits.

Also, the External Interrupt OD Control bit (IRRCNT.OD) of the Interrupt Request Control Register

can select whether the external interrupt supply signal is open drain output or totem pole output.

Figure 15.3.1 External Interrupt Request Logic

IRFLAG[15]

IRPOL[15]

IRMASK[15]

IRRCNT.EXTPOL

Internal Interrupt

Request

(0: Request present)

External Interrupt Request

IRRCNT.INTPOL

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