TMP320C2811PBKA datasheet(77/147 Pages) TI

77 / 147 page

Peripherals

June 2004

SPRS257

4.8

GPIO MUX

The GPIO Mux registers, are used to select the operation of shared pins on R281x devices. The pins can be

individually selected to operate as “Digital I/O” or connected to “Peripheral I/O” signals (via the GPxMUX

registers). If selected for “Digital I/O” mode, registers are provided to configure the pin direction (via the

GPxDIR registers) and to qualify the input signal to remove unwanted noise (via the GPxQUAL) registers).

Table 4−11 lists the GPIO Mux Registers.

Table 4−11. GPIO Mux Registers†‡§

NAME

ADDRESS

SIZE (x16)

GPAMUX

0x00 70C0

GPIO A Mux Control Register

GPADIR

0x00 70C1

GPIO A Direction Control Register

GPAQUAL

0x00 70C2

GPIO A Input Qualification Control Register

reserved

0x00 70C3

GPBMUX

0x00 70C4

GPIO B Mux Control Register

GPBDIR

0x00 70C5

GPIO B Direction Control Register

GPBQUAL

0x00 70C6

GPIO B Input Qualification Control Register

reserved

0x00 70C7

reserved

0x00 70C8

reserved

0x00 70C9

reserved

0x00 70CA

reserved

0x00 70CB

GPDMUX

0x00 70CC

GPIO D Mux Control Register

GPDDIR

0x00 70CD

GPIO D Direction Control Register

GPDQUAL

0x00 70CE

GPIO D Input Qualification Control Register

reserved

0x00 70CF

GPEMUX

0x00 70D0

GPIO E Mux Control Register

GPEDIR

0x00 70D1

GPIO E Direction Control Register

GPEQUAL

0x00 70D2

GPIO E Input Qualification Control Register

reserved

0x00 70D3

GPFMUX

0x00 70D4

GPIO F Mux Control Register

GPFDIR

0x00 70D5

GPIO F Direction Control Register

reserved

0x00 70D6

reserved

0x00 70D7

GPGMUX

0x00 70D8

GPIO G Mux Control Register

GPGDIR

0x00 70D9

GPIO G Direction Control Register

reserved

0x00 70DA

reserved

0x00 70DB

reserved

0x00 70DC

0x00 70DF

† Reserved locations will return undefined values and writes will be ignored.

‡ Not all inputs will support input signal qualification.

§ These registers are EALLOW protected. This prevents spurious writes from overwriting the contents and corrupting the system.

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