Datasheet

56F8355 Technical Data, Rev. 17
102 Freescale Semiconductor
Preliminary
• 11 = Required nested exception priority level is 3
5.6.30.3 Vector Number - Vector Address Bus (VAB)—Bits 12–6
This read-only field shows the vector number (VAB[7:1]) used at the time the last IRQ was taken. This
field is only updated when the 56800E core jumps to a new interrupt service routine.
Note: Nested interrupts may cause this field to be updated before the original interrupt service routine can
read it.
5.6.30.4 Interrupt Disable (INT_DIS)—Bit 5
This bit allows all interrupts to be disabled.
• 0 = Normal operation (default)
• 1 = All interrupts disabled
5.6.30.5 Reserved—Bit 4
This bit field is reserved or not implemented. It is read as 1 and cannot be modified by writing.
5.6.30.6 IRQB State Pin (IRQB STATE)—Bit 3
This read-only bit reflects the state of the external IRQB pin.
5.6.30.7 IRQA State Pin (IRQA STATE)—Bit 2
This read-only bit reflects the state of the external IRQA pin.
5.6.30.8 IRQB Edge Pin (IRQB Edg)—Bit 1
This bit controls whether the external IRQB interrupt is edge or level sensitive. During Stop and Wait
modes, it is automatically level sensitive.
•0 = IRQB interrupt is a low-level sensitive (default)
•1 = IRQB
interrupt is falling-edge sensitive.
5.6.30.9 IRQA Edge Pin (IRQA Edg)—Bit 0
This bit controls whether the external IRQA interrupt is edge- or level-sensitive. During Stop and Wait
modes, it is automatically level-sensitive.
•0 = IRQA interrupt is a low-level sensitive (default)
•1 = IRQA
interrupt is falling-edge sensitive.
5.7 Resets
5.7.1 Reset Handshake Timing
The ITCN provides the 56800E core with a reset vector address whenever RESET is asserted. The reset
vector will be presented until the second rising clock edge after RESET
is released.