WM8350GEB/RV Wolfson Microelectronics, WM8350GEB/RV Datasheet - Page 182

• Manufacturer Part Number: WM8350GEB/RV
• Description: Audio CODECs Audio CODEC plus pwr management
• Manufacturer: Wolfson Microelectronics

Specifications of WM8350GEB/RV

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8350
w
20.1.1
To configure a pin as a GPIO, the corresponding GPn_FN register bits must be set to 0000 (see
Table 125). Each GPIO pin can be set up as an input or as an output through the corresponding
GPn_DIR register bits. Note that, when changing GPn_DIR, it is recommended to set GPn_FN =
0000 first. See Section 20.2.2 for the recommended sequence of commands when updating the
GPIO pin function.
The state of a GPIO output is determined by writing to the corresponding GPn_LVL register bit. For
GPIO inputs, reading the GPn_LVL bit returns the logic level at the GPIO pin.
The polarity of GPIO inputs can be selected through the corresponding GPn_CFG bit. For GPIO
outputs, the GPn_CFG bit controls the electrical characteristics of the output pin.
GPIO inputs can also generate an interrupt (see Section 20.1.3). The GPn_INTMODE selects
whether an interrupt occurs on a rising edge only, or else on both rising and falling edges. The input
to this function is influenced by the polarity bit GPn_CFG described above.
R129 (81h)
GPIO pull-up
R130 (82h)
GPIO
pull-down
R131 (83h)
GPIO Interrupt
Mode
R134 (86h)
GPIO Pin
Configuration
R135 (87h)
GPIO Pin
Polarity / Type
R230 (E6h)
GPIO pin
status
Note: n is a number between 0 and 12 that identifies the individual GPIO.
Table 121 Configuring the GPIO Pins
Note: The GPIO input functions /MR, /WAKEUP and /LDO_ENA behave differently to other GPIO
inputs. These functions are Active Low by default, when GPn_CFG = 1. These functions may be
changed to Active High by setting GPn_CFG = 0.
ADDRESS
CONFIGURING GPIO PINS
12:0
12:0
12:0
12:0
12:0
12:0
BIT
GPn_PU [12:0]
GPn_PD [12:0]
GPn_INTMODE
[12:0]
GPn_DIR [12:0]
GPn_CFG
[12:0]
GPn_LVL [12:0]
LABEL
on CONFIG
on CONFIG
on CONFIG
on CONFIG
Dependant
Dependant
Dependant
Dependant
DEFAULT
settings
settings
settings
settings
N/A
0
GPIOn pull-up
0 = Normal
1 = Pull-up enabled
Only valid when GPIOn is set to
input. Do not select pull-up and pull-
down at the same time. (see note)
GPIOn pull-down
0 = Normal
1 = Pull-down enabled
Only valid when GPIOn is set to
input. Do not select pull-up and pull-
down at the same time. (see note)
GPIOn Pin Mode:
0 = GPIO interrupt is rising edge
triggered and taken after the effect
of GPn_CFG register bit
1 = GPIO interrupt is both rising and
falling edge triggered
GPIOn pin direction
0 = Output
1 = Input
Selects input polarity /output type for
GPIOn
Input
(GPn_DIR=1)
0 = active low
1 = active high
(see note)
Logic level of GPIOn pin
Input
(GPn_DIR=1)
Read GPn_LVL to
check logic level.
Writing ‘0’ clears
GPn_EINT
PD, February 2011, Rev 4.4
DESCRIPTION
Production Data
Output
(GPn_DIR=0)
0 = CMOS
1 = open-drain
(see note)
Output
(GPn_DIR=0)
Write to
GPn_LVL to
change logic
level.
182