M38040F2HKP datasheet(206/387 Pages) RENESAS

206 / 387 page

2-82

APPLICATION

2.4 Serial interface

Rev.1.00 Jan 14, 2005

REJ09B0212-0100Z

3804 Group (Spec.H)

➂ Stop of transmit/receive operation

Only transmission operation is stopped.

Clear the transmit enable bit to “0” (transmit disabled). Transmission operation does not stop by

setting the serial I/Oi enable bit (i = 1, 3) to “0”.

q Reason

This is the same as ➀ in (1).

Only receive operation is stopped.

Clear the receive enable bit to “0” (receive disabled).

(3)

SRDYi (i = 1, 3) output of reception side

When signals are output from the SRDYi pin on the reception side by using an external clock in the

clock synchronous serial I/O mode, set all of the receive enable bit, the SRDYi output enable bit, and

the transmit enable bit to “1” (transmit enabled).

(4)

Setting serial I/Oi (i = 1, 3) control register again

Set the serial I/Oi control register again after the transmission and the reception circuits are reset

by clearing both the transmit enable bit and the receive enable bit to “0.”

Fig. 2.4.44 Sequence of setting serial I/Oi (i = 1, 3) control register again

(5)

Data transmission control with referring to transmit shift register completion flag

After the transmit data is written to the transmit buffer register, the transmit shift register completion

flag changes from “1” to “0” with a delay of 0.5 to 1.5 shift clocks. When data transmission is

controlled with referring to the flag after writing the data to the transmit buffer register, note the

delay.

(6)

Transmission control when external clock is selected

When an external clock is used as the synchronous clock for data transmission, set the transmit

enable bit to “1” at “H” of the SCLKi (i = 1, 3) input level. Also, write the transmit data to the transmit

buffer register at “H” of the SCLKi input level.

Clear both the transmit enable

bit (TE) and the receive enable

bit (RE) to “0”

↓

Set the bits 0 to 3 and bit 6 of the

serial I/Oi control register

↓

Set both the transmit enable bit

(TE) and the receive enable bit

(RE), or one of them to “1”

Can be set with the

LDM instruction at

the same time

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