MC68HC908GR4MP datasheet(197/286 Pages) FREESCALE

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Exception Control

MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7

Freescale Semiconductor

197

19.5.1.3 Interrupt Status Registers

The flags in the interrupt status registers identify maskable interrupt sources. Table 19-3 summarizes the

interrupt sources and the interrupt status register flags that they set. The interrupt status registers can be

useful for debugging.

19.5.1.4 Interrupt Status Register 1

I6–I1 — Interrupt Flags 1–6

These flags indicate the presence of interrupt requests from the sources shown in Table 19-3.

1 = Interrupt request present

0 = No interrupt request present

Bit 0 and Bit 1 — Always read 0

Table 19-3. Interrupt Sources

Priority

Interrupt Source

Interrupt Status

Highest

Reset

—

SWI instruction

—

IRQ pin

PLL

TIM1 channel 0

TIM1 channel 1

TIM1 overflow

TIM2 channel 0

Reserved

TIM2 overflow

SPI receiver full

SPI transmitter empty

I10

SCI receive error

I11

SCI receive

I12

SCI transmit

I13

Keyboard

I14

ADC conversion complete

I15

Lowest

Timebase module

I16

Address:

$FE04

Bit 7

654321

Bit 0

Read:

I6I5I4I3I2I1

Write:

RRRRRRRR

Reset:

00000000

R= Reserved

Figure 19-12. Interrupt Status Register 1 (INT1)

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