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3.3.10. Mode control select register, GPIOAFSEL

The GPIOAFSEL register is the mode control select register. Writing a 1 to any bit in this register selects the hardware control for the corresponding PrimeCell GPIO line. All bits are cleared by a reset, therefore no PrimeCell GPIO line is set to hardware control by default.

Table 3.11 shows the bit assignment of the GPIOAFSEL register.

GPIOAFSEL register

Bits

Name

Type

Function

7:0

Mode control select register

Read/write

Bit set, enables hardware control mode.

Bit cleared, enables software control mode.

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