Service Guide

Wi-Fi&Bluetooth Module Series
FC908A_Hardware_Design 26 / 49
3.5.4. Introduction of WLAN Pin Multiplexing Function
Table 11: Pin setting description
As shown in the above table, SDIO and SPI* modes can be configured through SDIO_DATA2. The SPI*
function is currently under development. The following is the definition of SPI* pin multiplexing:
Table 12: Pin Definition of SDIO Interface
SDIO_DATA2
Mode
Note
L
SPI*
Sampling at power-on reset.
H
SDIO
Pin Name
Pin No.
SPI Mode
Description
SDIO_DATA2
14
NC
/
SDIO_DATA3
15
CS
Card select
SDIO_CMD
16
DI
Data input
SDIO_CLK
17
SCLK
Clock
SDIO_DATA0
18
DO
Data output
SDIO_DATA1
19
IRQ
Interrupt