Motorola MC68VZ328 - Manual (Page 190)

10-20 MC68VZ328 User’s Manual
Programming Model
10.4.5.7 Port D Interrupt Request Enable Register
The interrupt enable bits (IQEN[3:0]) determine which INT[3:0] will generate an interrupt to the interrupt
controller module. The settings for the bit positions of PDIRQEN are shown in Table 10-23.
PDIRQEN Port D Interrupt Request Enable Register 0x(FF)FFF41D
10.4.5.8 Port D Keyboard Enable Register
All the selected signals are active low in reference to the external pins, and those that are asserted will
generate a keyboard interrupt to the interrupt controller. When a KBENx bit is selected, the DIRx bits need
to be configured as an input. The SELx, POLx, IQENx, and IQEGx bits have no effect on the functionality
of KBENx. Deasserting the interrupt source is the only way to clear a keyboard interrupt. The settings for
the bit positions of PDKBEN are shown in Table 10-24.
PDKBEN Port D Keyboard Enable Register 0x(FF)FFF41E
10.4.5.9 Port D Interrupt Request Edge Register
The polarity of the rising or falling edge is selected by the POLx bits. It should be noted that the edge-level
interrupt for INT[3:0] cannot be used for system wake up. The level-sensitive interrupt should be used. The
settings for the bit positions of PDIRQEG are shown in Table 10-25 on page 10-21.
BIT 7 6 5 4 3 2 1 BIT 0
IQEN3 IQEN2 IQEN1 IQEN0
TYPE rw rw rw rw
RESET
0 0 0 0 0 0 0 0
0x00
Table 10-23. Port D Interrupt Request Enable Register Description
Name Description Setting
Reserved
Bits 7–4 Reserved These bits are reserved and should be set
to 0.
IQENx
Bits 3–0 Interrupt Enable—These bits select the INT[3:0]
pins that are presented to the interrupt controller. 0 = Interrupt disabled.
1 = Interrupt enabled.
BIT 7 6 5 4 3 2 1 BIT 0
KBEN7 KBEN6 KBEN5 KBEN4 KBEN3 KBEN2 KBEN1 KBEN0
TYPE rw rw rw rw rw rw rw rw
RESET
0 0 0 0 0 0 0 0
0x00
Table 10-24. Port D Keyboard Enable Register Description
Name Description Setting
KBENx
Bits 7–0 Keyboard Enable—These bits select the INT[3:0]
pins that are presented to the interrupt controller. 0 = The keyboard interrupt is disabled.
1 = The keyboard interrupt is enabled.