Datasheet

Chapter 6 Parallel Input/Output Control
MC9S08SG32 Data Sheet, Rev. 8
90 Freescale Semiconductor
6.6.2.7 Port B Interrupt Pin Select Register (PTBPS)
6.6.2.8 Port B Interrupt Edge Select Register (PTBES)
76543210
R0000
PTBPS3 PTBPS2 PTBPS1 PTBPS0
W
Reset: 00000000
Figure 6-17. Port B Interrupt Pin Select Register (PTBPS)
Table 6-16. PTBPS Register Field Descriptions
Field Description
3:0
PTBPS[3:0]
Port B Interrupt Pin Selects — Each of the PTBPSn bits enable the corresponding port B interrupt pin.
0 Pin not enabled as interrupt.
1 Pin enabled as interrupt.
76543210
R0000
PTBES3 PTBES2 PTBES1 PTBES0
W
Reset: 00000000
Figure 6-18. Port B Edge Select Register (PTBES)
Table 6-17. PTBES Register Field Descriptions
Field Description
3:0
PTBES[3:0]
Port B Edge Selects — Each of the PTBESn 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 and detects falling edge/low level for interrupt generation.
1 A pull-down device is connected to the associated pin and detects rising edge/high level for interrupt
generation.