M38268EBFS datasheet(32/91 Pages) RENESAS

32 / 91 page

Rev.1.00

Sep 06, 2006

page 32 of 88

REJ03B0181-0100

3826 Group (One Time PROM version)

[Transmit Buffer/Receive Buffer Register (TB/

RB)] 001816

The transmit buffer register and the receive buffer register are lo-

cated at the same address. The transmit buffer register is write-

only and the receive buffer register is read-only. If a character bit

length is 7 bits, the MSB of data stored in the receive buffer regis-

ter is “0”.

[Serial I/O1 Status Register (SIO1STS)]

001916

The read-only serial I/O1 status register consists of seven flags

(bits 0 to 6) which indicate the operating status of the serial I/O1

function and various errors.

Three of the flags (bits 4 to 6) are valid only in UART mode.

The receive buffer full flag (bit 1) is set to “0” when the receive

buffer register is read.

If there is an error, it is detected at the same time that data is

transferred from the receive shift register to the receive buffer reg-

ister, and the receive buffer full flag is set to “1”. A write signal to

the serial I/O1 status register sets all the error flags (OE, PE, FE,

and SE) (bit 3 to bit 6, respectively) to “0”. Writing “0” to the serial

I/O1 enable bit (SIOE) also sets all the status flags to “0”, includ-

ing the error flags.

All bits of the serial I/O1 status register are set to “0” at reset, but

if the transmit enable bit of the serial I/O1 control register has

been set to “1”, the transmit shift register shift completion flag and

the transmit buffer empty flag become “1”.

[Serial I/O1 Control Register (SIO1CON)]

001A16

The serial I/O1 control register contains eight control bits for the

serial I/O1 function.

[UART Control Register (UARTCON)] 001B16

The UART control register consists of the bits which set the data

format of a data transmit and receive, and the bit which sets the

output structure of the P45/TXD pin.

[Baud Rate Generator (BRG)] 001C16

The baud rate generator is the 8-bit counter equipped with a

reload register. Set the division value of the BRG count source to

the baud rate generator.

The baud rate generator divides the frequency of the count source

by 1/(n + 1), where n is the value written to the baud rate

generator.

■Notes on serial I/O

When setting the transmit enable bit to “1”, the serial I/O1 transmit

interrupt request bit is automatically set to “1”. When not requiring

the interrupt occurrence synchronous with the transmission en-

abled, take the following sequence.

➀Set the serial I/O1 transmit interrupt enable bit to “0” (disabled).

➁Set the transmit enable bit to “1”.

➂Set the serial I/O1 transmit interrupt request bit to “0” after 1 or

more instructions have been executed.

➃Set the serial I/O1 transmit interrupt enable bit to “1” (enabled).

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