MEDs Technologies Pte Ltd MBTM64 用户手册

Table 3.2.3: Example of bit clock frequency in a master mode 

3.2.4 Serial Memory Interface 
 
The serial memory interface can be selected as I2C or SPI bus interface that has the following features 
 

  Operation Voltage : 1.8V or 3.3V 
  Interface mode ; I2C bus, SPI 

o

  SPI Interface 



  Operation mode : SPI Master 



  Chip select : 2 channels 



  Chip select polarity : High active, low active 



  Serial clock frequency : 76.47kHz – 19.5MHz (CPU 39Hz) 

101.96kHz – 26MHz (CPU 52MHz) 



  Serial data transfer mode : MSB first, LSB first. 

 

  Interface mode ; I2C bus, SPI 

o

  I2C Interface 



  Operation mode : I2C Master 



  Clock frequency : Standard mode (100kHz or less) 

    Fast mode (400Hz or less) 



  Output mode: Open drain output, CMOS output. Pull up resistors 



  Device address format: 7 bit address. 

 

 

Figure 3.2.4a: Connection of Exernal Flash/EEPROM and other I2C Device 

 

There are 2 I2C EEPROM already available on Module 64. One EEPROM is mandatory for storing of   
unique Bluetooth device address for each module. The 2

nd

 EEPROM is optional. 

 

 

Figure 3.2.4b: Connection of External Serial Flash/EEPROM and order Serial devices