Datasheet

Chapter 6 Parallel Input/Output Control
MC9S08EL32 Series and MC9S08SL16 Series Data Sheet, Rev. 3
86 Freescale Semiconductor
6.5.1.7 Port A Interrupt Pin Select Register (PTAPS)
6.5.1.8 Port A Interrupt Edge Select Register (PTAES)
76543210
R0000
PTAPS3 PTAPS2 PTAPS1 PTAPS0
W
Reset:00000000
Figure 6-9. Port A Interrupt Pin Select Register (PTAPS)
Table 6-7. PTAPS Register Field Descriptions
Field Description
3:0
PTAPS[3:0]
Port A Interrupt Pin Selects — Each of the PTAPSn bits enable the corresponding port A interrupt pin.
0 Pin not enabled as interrupt.
1 Pin enabled as interrupt.
76543210
R0000
PTAES3 PTAES2 PTAES1 PTAES0
W
Reset:00000000
Figure 6-10. Port A Edge Select Register (PTAES)
Table 6-8. PTAES Register Field Descriptions
Field Description
3:0
PTAES[3:0]
Port A Edge Selects — Each of the PTAESn bits serves a dual purpose by selecting the polarity of the active
interrupt edge as well as selecting a pull-up or pull-down device if enabled.
0 A pull-up device is connected to the associated pin interrupt and detects falling edge/low level for interrupt
generation.
1 A pull-down device is connected to the associated pin interrupt and detects rising edge/high level for interrupt
generation.