USB2227/USB2228
DS00002256A-page 20 2007-2016 Microchip Technology Inc.
7.0 GPIO USAGE
TABLE 7-1: GPIO USAGE (ROM REV -11)
Name Active Level Symbol Description and Note
GPIO1 H Flash Media Activity LED/
xD_Door
Indicates media activity. Media or USB
cable must not be removed with LED lit.
Also may be used for xD Door
functionality
GPIO2 H EE_CS Serial EE PROM chip select
GPIO3 H V_BUS USB V bus detect
GPIO4 H EE_DIN/EE_DOUT/xDID Serial EE PROM input/output and xD
Identify
GPIO5 L HS_IND/SD_CD HS Indicator LED or SD Card Detect
Switch input
GPIO6 H A16/ROMEN A16 address line connect for DFU or
debug LED indicator optional.
GPIO7 H EE_CLK/
UNCONF_LED
Serial EE PROM clock output or
Unconfigured LED.
GPIO8 L MS_PWR_CTRL/
CRD_PWR0
Memory Stick Card Power Control, or
Internal Power FET0.
GPIO9 L CF_PWR_CTRL CompactFlash Card Power Control
GPIO10 L SM_PWR_CTRL/
CRD_PWR1
SmartMedia Card Power Control, or
Internal Power FET1.
GPIO11 L SD/MMC_PWR_CTRL/
CRD_PWR2
SD/MMC Card Power Control, or Internal
Power FET2.
GPIO12 H MS_ACT_IND/
Media Activity
Memory Stick Activity Indicator, or Media
Activity LED.
GPIO13 H CF_ACT_IND CompactFlash Activity Indicator
GPIO14 H SM_ACT_IND SmartMedia Activity Indicator
GPIO15 H SD/MMC_ACT_IND SD/MMC Activity Indicator
