CMS32L051 User Manual |Chapter 12 Universal Serial Communication Unit
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12.9 Simplified I
2
C (IIC00, IIC01, IIC10, IIC11, IIC20, IIC21) communication operation
This is a function that synchronizes clock communication with multiple devices through a total of 2 lines of
serial clock (SCL) and serial data (SDA). Because this simplified I
2
C is designed for single communication with
EEPROM, flash memory, A/D converters, etc., it is only used as a master device.
For start and stop conditions, AC specifications must be adhered to and processed by software while
operating the control registers.
[Transmit and receive data]
Master sending, master receiving (limited to single master control functions).
ACK output function
Note
, ACK detection function
8 bits of data length (when sending the address, specify the address with a high 7 bits, and use the
lowest bit for R/W control).
Generate start conditions and stop conditions through the software.
[Interrupt function]
End of transfer interruption
[Error detection flag]
•
ACK error
※[Features not supported by Simplified I
2
C]
Slave transmission, slave reception
Multi-master function (arbitration failure detection function).
Wait for detection function
Note When receiving the last data, if you write 0 to the SDOEmn bit (SDOEm register) to stop the
output of the serial communication data, the ACK is not output. For details, please refer to
12.9.3(2) Processing Flow.
Remark m: Unit number (m=0, 1) n: Channel number (n=0~3)mn=00~ 03, 10~11
Channels 0 to 3 of SCI0 and channels 0 to 1 of SCI1 support Simplified I
2
C (IIC00, IIC01, IIC10, IIC11,
IIC20, IIC21) channels.
Simplified I
2
C (IIC00, IIC01, IIC10, IIC11, IIC20, IIC21, IIC30, IIC31) have the following four types of
communication operations:
Address segment transmission (see 12.9.1).
Datat transmission (see 12.9.2).
Data reception (see 12.9.3).
Generation of stop conditions (see12.9.4).
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