Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  12   SERIAL  ARRAY  UNIT 

R01UH0305EJ0200  Rev.2.00 

 

 

544  

Jul 04, 2013 

 

This is a clocked communication function to communicate with two or more devices by using two lines: serial clock 

(SCL) and serial data (SDA).  This communication function is designed to execute single communication with devices such 

as EEPROM, flash memory, and A/D converter, and therefore, can be used only by the master. 

Operate the control registers by software for setting the start and stop conditions while observing the specifications of 

the I

2

C bus line 

 [Data transmission/reception] 

•  Master transmission, master reception (only master function with a single master) 
•  ACK output function

 and ACK detection function 

•  Data length of 8 bits  

  (When an address is transmitted, the address is specified by the higher 7 bits, and the least significant bit is 

used for R/W control.) 

•  Generation of start condition and stop condition for software 

 [Interrupt function] 

•  Transfer end interrupt 

[Error detection flag] 

•  Overrun error  
•  ACK error 

 

*  [Functions not supported by simplified I

2

C] 

•  Slave transmission, slave reception 
•  Multi-master function (arbitration loss detection function) 
•  Wait detection function 

 

Note  When receiving the last data, ACK will not be output if 0 is written to the SOEmn (SOEm register) bit and serial 

communication data output is stopped.  See the processing flow in 12.8.3 (2) for details. 

 

Remark  m: Unit number (m = 0, 1), n: Channel number (n = 0 to 3), mn = 00 to 03, 10, 11