AS3682-EB2 datasheet(31/43 Pages) AMSCO

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AS3682

austriamicrosystems

Data Sheet

General Purpose Inputs/Outputs

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Revision 2.21

31 - 43

11.6 General Purpose Inputs/Outputs

The general purpose input/output pins (GPIO0/P0, STROBE/F2) are highly configurable and can be used for the fol-

lowing functionality:

Digital Schmidt-Trigger Input

Digital Output with 4mA Driving Capability at 2.8V Supply (VDD_GPIO)

Tristate Output

Current Selection for CURR1x

The default mode for pins GPIO0/P0 and STROBE/F2 is input (pull-down for normal mode and pull-up for soft flash or

hard flash modes).

Note:

Each general purpose pin is independent of the other general purpose pin.

Table 31. GPIO Registers

Addr: 0A

GPIO_control

This register controls pins GPIO0/P0 and STROBE/F2.

Bit

Bit Name

Default

Access

Description

1:0

gpio0_mode

00b

R/W

Defines the direction for pin GPIO0/P0.

00 = Input only.

01 = Output (push and pull).

10 = Output (open drain, only NMOS is active).

11 = Output (open drain, only PMOS is active).

3:2

gpio0_pulls

01b Normal

Mode

10b Soft Flash

Mode

R/W

Adds pullup/pulldown functionality to pin GPIO0/P0.

00 = None

01 = Pulldown

10 = Pullup

11 = Analog input (for test purposes only).

5:4

strobe_mode

00b

R/W

Defines the direction for pin STROBE/F2.

00 = Input only.

01 = Output (push and pull).

10 = Output (open drain, only NMOS is active).

11 = Output (open drain, only PMOS is active).

7:6

strobe_pulls

01b Normal

Mode

10b Soft Flash

Mode

R/W

Adds pullup/pulldown functionality to pin STROBE/F2.

00 = None

01 = Pulldown

10 = Pullup

11 = Analog input (for test purposes only)

Addr: 0B

GPIO_output

This register selects internal signals to be switched to pins GPIO0/P0 and STROBE/F2

(if selected as output).

Bit

Bit Name

Default

Access

Description

gpio0_out

0R/W

In normal mode, if pin GPIO0/P0 is set to output, this bit is

transferred to that output.

strobe_out

0R/W

In normal mode, if pin STROBE/F2 is set to output, this bit

is transferred to that output.

2:7

N/A

Addr: 0C

GPIO_input

This register reads the signals at pins GPIO0/P0 and STROBE/F2 (if selected as input).

Bit

Bit Name

Default

Access

Description

gpio0_in

N/A

strobe_in

N/A

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