68HC705JB4 datasheet(38/134 Pages) FREESCALE

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GENERAL RELEASE SPECIFICATION

February 24, 1999

MOTOROLA

INTERRUPTS

MC68HC05JB4

4-8

REV 2

NOTE

The BIH and BIL instructions will only apply to the level on the IRQ pin itself, and

not to the output of the logic OR function with the PA0 to PA3 pins. The state of the

individual Port A pins can be checked by reading the appropriate Port A pins as

inputs.

NOTE

If enabled, the PA0 to PA3 pins will cause an IRQ interrupt only when the

corresponding pin is conﬁgured as input.

4.5.5 Timer1 Interrupt (TIMER1)

The TIMER1 interrupt is generated by the 16-bit timer when either an overﬂow or

an input capture or output compare has occurred as described in the section on

16-bit timer. The interrupt ﬂags and enable bits for the Timer1 interrupts are

located in the Timer1 Control & Status Register (TSR) located at $0012, $0013.

The I-bit in the CCR must be clear in order for the TIMER1 interrupt to be enabled.

Either of these three interrupts will vector to the same interrupt service routine

located at the address speciﬁed by the contents of memory locations $1FF6 and

$1FF7.

4.5.6 USB Interrupt (USB)

The USB interrupt is generated by the USB module as described in the section on

Universal Serial Bus. The interrupt enable bits for the USB interrupt are located at

bit3-bit2 of UIR0 REG and bit3-bit2 of UIR1 REG. Also Once the device goes into

Suspend Mode, any bus activities will cause the USB to generate an interrupt to

CPU to come out from the Suspend mode. The I-bit in the CCR must be clear in

order for the USB interrupt to be enabled. Either of these two interrupts will vector

to the same interrupt service routine located at the address speciﬁed by the con-

tents of memory locations $1FF8 and $1FF9.

4.5.7 MFT Interrupt (MFT)

The MFT interrupt is generated by the MFT module as described in the section on

Multi-function Timer. These interrupts will vector to the same interrupt service rou-

tine located at the address speciﬁed by the contents of memory locations $1FF4

and $1FF5.

Freescale Semiconductor, Inc.

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