Maxim Integrated MAX32660 - Table 6-19: GPIO Pullup;Pulldown Enable Register; Table 6-20: GPIO Alternate Function Select Register; Table 6-21: GPIO Input Hysteresis Enable Register; Table 6-22: GPIO Slew Rate Enable Register

MAX32660 User Guide
Maxim Integrated Page 67 of 195
Table 6-19: GPIO Pullup/Pulldown Enable Register
GPIO Pullup Pulldown Selection 0 Register
GPIO0_PULL_EN
[0x0060]
Bits
Name
Access
Reset
Description
31:14
-
R/W
0
Reserved for Future Use
Do not modify this field.
13:10
-
R/W
0
GPIO Pull Up/Pull Down Enable
Setting this bit to 1 enables either the weak pull-up or weak pull-down resistor on the
respective pin. The selection for pull-up or pull-down resistor is set using the
GPIO_PULL_SEL register.
9:8
-
R/W
0
GPIO Pull Down Enable
Setting this bit to 1 enables the weak pull-down resistor on the respective I/O pin.
GPIO with I
2
C as an alternate function do not support a weak pull-up resistor. If either
of the GPIO_PULL_SEL[9:8] bits are set to 1, setting the same bit in this register has no
effect.
0: Pull down resistor disable.
1: Pull down resistor enabled if respective bit in GPIO_PULL_SEL register is set to 0.
No effect if respective bit in GPIO_PULL_SEL register is set to 1.
Table 6-20: GPIO Alternate Function Select Register
GPIO Alternate Function Select Register
GPIO0_AF1_SEL
[0x0068]
Bits
Name
Access
Reset
Description
31:14
-
R/W
0
Reserved for Future Use
Do not modify this field.
13:0
-
R/W
0
GPIO Alternate Function 1 Mode Select
This bit combined with the corresponding bit in the GPIO0_AF0_SEL register set the
I/O pin to GPIO mode or to Alternate Function 1, 2, or 3. Refer to Table 6-5: GPIO
Mode and Alternate Function Selection for details on selection.
Table 6-21: GPIO Input Hysteresis Enable Register
GPIO Input Hysteresis Enable Register
GPIO0_INHYS_EN
[0x00A8]
Bits
Name
Access
Reset
Description
31:14
-
R/W
0
Reserved for Future Use
Do not modify this field.
13:0
-
R/W
0
GPIO Input Hysteresis Enable
Setting a bit to 1 enables a Schmitt input to introduce hysteresis for better noise
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0: Input pin uses a standard CMOS input.
1: Schmitt input enabled.
Table 6-22: GPIO Slew Rate Enable Register
GPIO Slew Rate Select Register
GPIO0_SR_SEL
[0x00AC]
Bits
Name
Access
Reset
Description
31: 14
-
R/W
0
Reserved for Future Use
Do not modify this field.