Mikroelektronika MIKROE-742 데이터 시트

The Multi Media Card (MMC) is a flash memory card standard. MMC cards are cur-
rently available in sizes up to and including 1 GB, and are used in cell phones, mp3
players, digital cameras, and PDA’s.
mikroPascal PRO for AVR provides a library for accessing data on Multi Media Card
via SPI communication.This library also supports SD(Secure Digital) memory cards.

Secure Digital (SD) is a flash memory card standard, based on the older Multi Media
Card (MMC) format. 
SD cards are currently available in sizes of up to and including 2 GB, and are used
in cell phones, mp3 players, digital cameras, and PDAs.

- Routines for file handling can be used only with FAT16 file system. 
- Library functions create and read files from the root directory only; 
- Library functions populate both FAT1 and FAT2 tables when writing to files, but the 

file data is being read from the FAT1 table only; i.e. there is no recovery if FAT1  
table is corrupted. 

- Prior to calling any of this library routines, Spi_Rd_Ptr needs to be initialized with 

the appropriate SPI_Read routine. 

271

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

var Mmc_Chip_Select :
sbit; sfr; external;

Chip select pin.

var Mmc_Chip_Select
: 

sbit at PINB.B0;

var
Mmc_Chip_Select_Direc
tion : 

Direction of the chip select pin.

var
Mmc_Chip_Select_Dir
ection : 

DDRB.B0;