Introduction; Gpio Description - Cirrus Logic CS485 Series User Manual

Introduction

CS485xx Hardware User's Manual
8.1 Introduction
The CS485xx has up to 19 GPIO pins available for system control functions. In order to fit the most
functionality possible into a small package, all of the GPIOs are multiplexed with other audio and control
ports on the CS485xx. This means that the number of GPIOs available to a given system depends on how
many of the pins are being used for audio functionality.
The GPIOs are also a crucial part of the Watchdog Timer implementation. One GPIO can be dedicated as a
watchdog alarm to indicate when the timer has expired.

8.2 GPIO Description

Table 8-1 identifies the GPIO pins available on the CS485xx.
Pin Name
8-1
Table 8-1. Digital Audio Output (DAO) Pins
Example Multiplexed Audio
GPIO0 DAI1_DATA1
GPIO1 DAI1_DATA2
GPIO2 DAI1_DATA3
GPIO3 DAO1_DATA1
GPIO4 DAO1_DATA2
GPIO5 DAO1_DATA3
GPIO6 DAO2_DATA0
GPIO7 DAO2_DATA1
GPIO8
GPIO9 SCP_MOSI
GPIO10 SCP_MISO
GPIO11
GPIO12
GPIO13
GPIO14 DAI2_LRCLK
GPIO15 DAI2_SCLK
GPIO16 DAI1_DATA0
GPIO17 DAI2_DATA0
GPIO18 DAO_MCLK
Copyright 2009 Cirrus Logic, Inc.
General Purpose Input/Output Pins
LQFP-48
Function Pin #
SCP_CS
SCP_CLK
SCP_IRQ
SCP_BSY
Chapter 8
Pin
Type
11 I/O
13 I/O
14 I/O
27 I/O
26 I/O
29 I/O
31 I/O
32 I/O
38 I/O
34 I/O
35 I/O
36 I/O
39 I/O
41 I/O
17 I/O
18 I/O
10 I/O
15 I/O
25 I/O
DS734UM7