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3.9 SIM& Micro SD Card Interface
The MT6223 contains a dedicated smart card interface to allow the MCU access to the SIM
card. It can operate via 4terminals, using SIMVCC, SIMI/O, SIMRST, SIMCLK
The SIMVCC is used to control the external voltage supply to the SIM card. SIMRST is used
as the SIM card reset signal. SIMI/O and SIMCLK are used for data exchange purpose.
The SIM interface acts as a half duplex asynchronous communication port and its data format
is composed of ten consecutive bits: a start bit in state Low, eight information bits, and a tenth
bit used for parity checking.
The micro SD CARD is controlled by MT6225&AIT706X.
Figure.3-9-1 SIM CARD Interface
Figure.3-9-2 Micro SD CARD Interface
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