R01AN1504EJ0100 Datasheet, PDF(8/50 Page) Renesas Technology Corp – Using the DTC to Perform Continuous Clock

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R01AN1504EJ0100 Datasheet, PDF (8/50 Pages) Renesas Technology Corp – Using the DTC to Perform Continuous Clock

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RL78/G14

Using the DTC to Perform Continuous Clock

Synchronous Serial Communication

Figure 4.2 shows transmit and receive timing, and DTC activation. Figure 4.3 shows the operation of DTCD0. Figure

4.4 shows the operation of DTCD1.

Transmit/receive

CSI00 transfer end

(1)

(2)

(3)

(4)

First byte

Second

byte

Third byte

Fourth

byte

Fifth byte Sixth byte

Seventh

byte

Eight byte

DTCCT0

INTCSI00 interrupt

DTC is activated

Figure 4.2 Timing of Transmission/Reception and DTC Activation

(1) Transmission/reception start

RL78/G14 starts transmission and reception after the DTC is configured.

Transmission is performed by the program writing the first byte of transmit data to the SIO00 register.

(2) DTC activation

After the first byte of data has been transmitted and received, DTC0 is activated. The first byte of receive data is

transferred from the SIO00 register to the transfer destination address.

When transfer of the receive data is completed, DTC1 is activated. The second byte of transmit data from the

transmit source address is transferred to the SIO00 register.

When the transmit data is written to the SIO00 register, the next transmission and reception start. The DTC is

activated every time when the transmission and reception are completed and the same procedure is repeated until the

transmission and reception of the eighth byte data is started. The DTCCT0 register value decrements each time the

DTC transfer is activated.

(3) INTCSI00 interrupt generated by the DTC transfer end

When the DTCCT0 register becomes 0, the INTCSI00 interrupt occurs.

Preparations to complete transmission and reception are performed in the program.

(4) INTCSI00 interrupt generated by transmission/reception end

When the transmission and reception of the eighth byte of data is completed, the INTCSI00 interrupt occurs. The

program reads and copies the eighth byte of receive data.

R01AN1504EJ0100 Rev. 1.00

Feb. 14, 2014

Page 8 of 47

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