RL78/G15 CHAPTER 12 SERIAL ARRAY UNIT
R01UH0959EJ0110 Rev.1.10 Page 491 of 765
Mar 7, 2023
12.7.2 Data Transmission
Data transmission is an operation to transmit data to the target for transfer (slave) after transmission of an address field.
After all data are transmitted to the slave, a stop condition is generated and the bus is released.
Simplified I
2
C IIC00 IIC01
Target channel Channel 0 of SAU0 Channel 1 of SAU0
Pins used SCL00, SDA00
Note 1
SCL01, SDA01
Note 1
Interrupt INTIIC00 INTIIC01
Transfer end interrupt only (Setting the buffer empty interrupt is prohibited.)
Error detection flag ACK error detection flag (PEFmn)
Transfer data length 8 bits
Transfer rate
Note 2
Max. f
MCK
/4 [Hz] (SDRmn[15:9] = 1 or more) f
MCK
: 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-reverse output (default: high level)
Parity bit No parity bit
Stop bit Appending 1 bit (for ACK reception timing)
Data direction MSB first
Note 1. To perform communication via simplified I
2
C, set the N-ch open-drain output (V
DD
tolerance) mode (POMxx =
1) with the port output mode register (POMxx). For details, see 4.3 Registers Controlling Port Function
and 4.5 Register Settings When Using Alternate Function.
Note 2. Use this operation within a range that satisfies the conditions above and the peripheral functions
characteristics specified in the electrical characteristics. For details, see CHAPTER 23 ELECTRICAL
SPECIFICATIONS (T
A
= −40 to +85°C) and CHAPTER 24 ELECTRICAL SPECIFICATIONS (T
A
= −40 to
+105°C, T
A
= −40 to +125°C).
Remark m: Unit number (m = 0), n: Channel number (n = 0, 1), mn = 00, 01
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