Renesas rl78 User Manual

RL78/G1A

CHAPTER 12 SERIAL ARRAY UNIT

R01UH0305EJ0200 Rev.2.00

553

Jul 04, 2013

12.8.2 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

IIC00 IIC01 IIC10 IIC11 IIC20 IIC21

Target channel

Channel 0 of

SAU0

Channel 1 of

SAU0

Channel 2 of

SAU0

Channel 3 of

SAU0

Channel 0 of

SAU1

Channel 1 of

SAU1

Pins used

SCL00,

SDA00

Note 1

SCL01,

SDA01

Note 1

SCL10,

SDA10

Note 1

SCL11,

SDA11

Note 1

SCL20,

SDA20

Note 1

SCL21,

SDA21

Note 1

INTIIC00 INTIIC01 INTIIC10 INTIIC11 INTIIC20 INTIIC21

Interrupt

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.

MCK

/4 [MHz] (SDRmn[15:9] = 1 or more)

MCK

: operation clock frequency of target channel

However, the following condition must be satisfied in each mode of I

•  Max. 1 MHz (first mode plus)
•  Max. 400 kHz (first mode)
•  Max. 100 kHz (standard mode)

Data level

Non-reversed output (default: high level)

Parity bit

No parity bit

Stop bit

Appending 1 bit (for ACK reception timing)

Data direction

MSB first

Notes 1. To perform communication via simplified I

C, set the N-ch open-drain output (V

tolerance (25- to 48-pin

products/EV

tolerance (64-pin products)) mode (POMxx = 1) for the port output mode registers (POMxx).

See 4.3 Registers Controlling Port Function and 4.5 Register Settings When Using Alternate Function

for details.

When IIC00, IIC10, IIC20 communicating with an external device with a different potential, set the N-ch open-

drain output (V

tolerance (25 to 48-pin products/EV

tolerance (64-pin products)) mode (POMxx = 1) also for

the clock input/output pins (SCL00, SCL10, SCL20).

See

4.4.5 Handling different potential (1.8 V, 2.5 V) by using I/O buffers for details.

2. Use this operation within a range that satisfies the conditions above and the peripheral functions characteristics

in the electrical specifications (see CHAPTER 29 ELECTRICAL SPECIFICATIONS (T

−40 to +85°C) and

CHAPTER 30 ELECTRICAL SPECIFICATIONS (G: INDUSTRIAL APPLICATIONS T

−40 to +105°C)).

Remark

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

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