32186 datasheet(584/1032 Pages) RENESAS

584 / 1032 page

SERIAL INTERFACE

12-36

32185/32186 Group Hardware Manual

Rev.1.10 REJ09B0235-0110 May 15, 07

Figure 12.3.4 Example of CSIO Transmission (Transmitted Successively)

Note 1: Changes of the Interrupt Controller's SIO Transmit Interrupt Control Register interrupt request bit

Note 2: When transmit buffer empty interrupt is enabled (DMA transfer can also be requested at the same time)

Note 3: When transmission finished interrupt is enable

Note 4: The Interrupt Controller's IVECT register is read or the SIO Transmit Interrupt Control Register interrupt request bit cleared

Note 5: A transmit interrupt request is generated when transmission is enabled.

Note 6: Be aware that even after transmit data is written to the transmit buffer, a transmit interrupt request is generated when the

data is transferred from the transmit buffer to the transmit shift register and the transmit buffer is thereby emptied.

Note 7: A transmission finished interrupt request is generated by a falling edge of the internal transfer clock pulse at which

transmission of the transmit shift register data has finished.

Note 8: It is inhibited to select the transmission finished interrupt when an external clock is selected.

: Interrupt request generated

: Processing by software

Transmit enable bit

Transmit buffer empty bit

Transmit status bit

TXD

SIO transmit interrupt request

(Note 1)

Transmit clock

(SCLKO)

(Note 2)

(Note 5)

(Note 2)

(Note 2)(Note 6)

Next data is written at a transmit

buffer empty interrupt

First data

Next data

Write to the

transmit buffer

(First data)

(Next data)

Write to the

transmit buffer

Cleared

SCLKO

TXD

SCLKI

RXD

Internal clock selected

External clock selected

Set

(Internal transfer clock)

(When transmit buffer empty

interrupt is selected)

(When transmission finished

interrupt is selected) (Note 8)

(Note 3)

Transmit interrupt request

(Note 3)(Note 7)

Interrupt request accepted (Note 4)

12.3 Transmit Operation in CSIO Mode

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