Renesas RL78/G10 - Address Field Transmission

RL78/G10 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0384EJ0311 Rev. 3.11 389
Dec 22, 2016
12.7.1 Address field transmission
Address field transmission is a transmission operation that first executes in I
2
C communication to identify the target for
transfer (slave). After a start condition is generated, an address (7 bits) and a transfer direction (1 bit) are transmitted in
one frame.
Simplified I
2
C IIC00
Target channel Channel 0 of SAU0
Pins used SCL00, SDA00
Note
Interrupt INTIIC00
Transfer end interrupt only (Setting the buffer empty interrupt is prohibited.)
Error detection flag ACK error detection flag (PEF0n)
Transfer data length
8 bits (transmitted with specifying the higher 7 bits as address and the least significant bit as
R/W control)
Transfer rate
Max. f
MCK/4 [Hz] (SDR0nH[7:1] = 1 or more) fMCK: Operation clock frequency of target channel
However, the following condition must be satisfied in each mode of I
2
C.
• Max. 400 kHz (fast mode)
• Max. 100 kHz (standard mode)
Data level Non-inversion output (default: high level)
Parity bit No parity bit
Stop bit Appending 1 bit (for ACK transmission/reception timing)
Data direction MSB first
Note To perform communication via simplified I
2
C, set the N-ch open-drain output (VDD tolerance) mode (POM01 = 1)
for the port output mode register (POM0) (see 4.3 Registers Controlling Port Function and 4.5 Register
Settings When an Alternate Function Is Used for details).
Remark n = 0