Renesas Asynchronous SH7145F Manuel d'utilisateur télécharger pdf (Page 12)

SH7145F

Asynchronous Serial Data Transmission/Reception

REJ06B0357-0100O/Rev.1.00 March 2004 Page 12 of 17

(2) SCI1 Initialize Routine

Yes

Cancel SCI1 module standby status

Clear to 0 bits TIE, RIE, TE, RE, MPIE,

and TEIE in SCR_0

Select on-chip clock as clock source

using CKE1 and CKE0 in SCR_0

Using SMR_1, select asynchronous

mode, 8 data bits, no parity, 1 stop bit,

and Pφ as baud rate generator clock

source

Using BRR_1, set communication

speed to 19,200 bps

Using DIR bit in SDCR_1, select

LSB-first communication

Using SCR_1, enable ERI interrupt

Using PACRL2, set PA3 (pin 133) to

RXD function and PA4 (pin 134)

to RXD function

Set bits TE and RE in SCR_1 to 1 to

enable transmit operation and receive

operation

Wait minimum

1-bit transfer time

init_sci()

RTE

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Renesas Asynchronous SH7145F Manuel d'utilisateur Page 12