Motorola MC68VZ328 - Manual (Page 166)

9-16 MC68VZ328 User’s Manual
Programming Model
9.6.5 Interrupt Pending Register
The read-only interrupt pending register (IPR) indicates which interrupts are pending. If an interrupt
source requests an interrupt, but that interrupt is masked by the interrupt mask register, then that interrupt
bit will be set in this register, but not in the interrupt status register. If the pending interrupt is not masked,
the interrupt bit will be set in both registers.
IPR Interrupt Pending Register 0x(FF)FFF310
BIT
31
30 29 28 27 26 25 24 23 22 21 20 19 18 17
BIT
16
EMI
Q
RTI
SPI
1
IRQ
5
IRQ
6
IRQ
3
IRQ
2
IRQ
1
TYPE rw rw rw rw rw rw rw rw
RESET 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0x00000000
BIT
15
14 13 12 11 10 9 8 7 6 5 4 3 2 1
BIT
0
PW
M2
UA
RT
2
INT
3
INT
2
INT
1
INT
0
PW
M1
KB
TM
R2
RT
C
WD
T
UA
RT
1
TM
R1
SPI
2
TYPE rw rw rw rw rw rw rw rw rw rw rw rw rw rw
RESET
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
0x00000000
Table 9-7. Interrupt Pending Register Description
Name Description Settings
Reserved
Bits 31–24 Reserved These bits are reserved and
should be set to 0.
EMIQ
Bit 23 Emulator Interrupt Pending—When set, this bit indicates that the
in-circuit emulation module or EMUIRQ pin is requesting an interrupt
on level 7. This bit can be generated from three interrupt sources:
two breakpoint interrupts from the in-circuit emulation module and an
external interrupt from EMUIRQ, which is an active low, edge-sensi-
tive interrupt. To clear this interrupt, you must read the ICEMSR reg-
ister to identify the interrupt source and write a 1 to the
corresponding bit of that register. See Section 16.2.4, “In-Circuit
Emulation Module Status Register,” on page 16-10 for more informa-
tion. 0 = No emulator interrupt is
pending.
1 = An emulator interrupt is
pending.
RTI
Bit 22 Real-Time Interrupt Pending (Real-Time Clock)—When set, this
bit indicates that the real-time timer interrupt is pending. The fre-
quency can be selected inside the real-time clock module, which can
function as an additional timer. 0 = No real-time timer
interrupt is pending.
1 = A real-time timer interrupt
is pending.
SPI1
Bit 21 SPI 1 Interrupt Pending—When set, this bit indicates an interrupt
event from SPI unit 1. 0 = No SPI 1 interrupt is
pending.
1 = An SPI 1 interrupt is
pending.