M68HC08 datasheet(114/332 Pages) FREESCALE

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System Integration Module (SIM)

Technical Data

MC68HC908JB16 — Rev. 1.1

114

System Integration Module (SIM)

Freescale Semiconductor

8.6.2.2 Interrupt Status Register 2

IF14–IF7 — Interrupt Flags 14–7

These flags indicate the presence of interrupt requests from the

sources shown in Table 8-4.

1 = Interrupt request present

0 = No interrupt request present

8.6.3 Reset

All reset sources always have equal and highest priority and cannot be

arbitrated.

8.6.4 Break Interrupts

The break module can stop normal program flow at a software-

programmable break point by asserting its break interrupt output. (See

Section 19. Break Module (BRK).) The SIM puts the CPU into the

break state by forcing it to the SWI vector location. Refer to the break

interrupt subsection of each module to see how each module is affected

by the break state.

8.6.5 Status Flag Protection in Break Mode

The SIM controls whether status flags contained in other modules can

be cleared during break mode. The user can select whether flags are

protected from being cleared by properly initializing the break clear flag

enable bit (BCFE) in the break flag control register (BFCR).

Address:

$FE05

Bit 7

654321

Bit 0

Read:

IF14

IF13

IF12

IF11

IF10

IF9

IF8

IF7

Write:

RRRRRRRR

Reset:

00000000

R= Reserved

Figure 8-13. Interrupt Status Register 2 (INT2)

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