Datasheet

F28M36P63C, F28M36P53C, F28M36H53C, F28M36H53B, F28M36H33C, F28M36H33B

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SPRS825C –OCTOBER 2012–REVISED FEBRUARY 2014

3.16.2 GPIO_MUX2

The eight pins of the GPIO_MUX2 block can be selectively mapped to eight General-Purpose Inputs, eight

General-Purpose Outputs, or six COMPOUT outputs from the Analog Comparator peripheral. Each

GPIO_MUX2 pin can have a pullup enabled or disabled. On reset, all pins of the GPIO_MUX2 block are

configured as analog inputs, and the GPIO function is disabled. The GPIO_MUX2 block is programmed

through a separate set of registers from those used to program GPIO_MUX1.

The multiple registers responsible for configuring the GPIO_MUX2 pins are organized in register set G.

They are accessible by the C28x CPU only. The middle portion of Figure 3-17 shows set G of Control

Subsystem registers, plus muxing logic for the associated eight GPIO pins. The GPGMUX1 register

selects one of six possible digital output signals from analog comparators, or one of eight general-purpose

GPIO digital outputs. The GPGPUD register disables pullups for the GPIO_MUX2 pins when a

corresponding bit of that register is set to “1”. Other registers of set G allow reading and writing of the

eight GPIO bits, as well as setting the direction for each of the bits (read or write). See Table 3-31 for the

mapping of comparator outputs and GPIO to the eight pins of GPIO_MUX2.

Peripheral Modes 0, 1, 2, and 3 are chosen by setting selected bit pairs of GPGMUX1 register to “00”,

“01”, “10”, and “11”, respectively. For example, setting bits 5–4 of the GPGMUX1 register to “00”

(Peripheral Mode 0) assigns pin GPIO194 to internal signal GPIO194 (digital GPIO). Setting bits 5– 4 of

the GPGMUX1 register to “11” (Peripheral Mode 3) assigns pin GPIO194 to internal signal COMP6OUT

coming from Analog Comparator 6. Peripheral Modes 1 and 2 are reserved and are not currently

available.

Table 3-31. GPIO_MUX2 Pin Assignments (C28x Peripheral Modes)

(1)

C28x C28x C28x C28x

Device Pin Name Peripheral Peripheral Peripheral Peripheral

Mode 0 Mode 1 Mode 2 Mode 3

GPIO192 GPIO192 – – –

GPIO193 GPIO193 – – COMP1OUT

GPIO194 GPIO194 – – COMP6OUT

GPIO195 GPIO195 – – COMP2OUT

GPIO196 GPIO196 – – COMP3OUT

GPIO197 GPIO197 – – COMP4OUT

GPIO198 GPIO198 – – –

GPIO199 GPIO199 – – COMP5OUT

(1) Blank fields represent Reserved functions.

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