M38040FFHKP datasheet(49/116 Pages) RENESAS

49 / 116 page

Rev.1.01

Jan 25, 2005

page 49 of 114

REJ03B0131-0101Z

3804 Group (Spec. H)

[Serial I/O3 Control Register (SIO3CON)]

003216

The serial I/O3 control register consists of eight control bits for the

serial I/O3 function.

[UART3 Control Register (UART3CON)]

003316

The UART control register consists of four control bits (bits 0 to 3)

which are valid when asynchronous serial I/O is selected and set

the data format of an data transfer, and one bit (bit 4) which is al-

ways valid and sets the output structure of the P35/TXD3 pin.

[Serial I/O3 Status Register (SIO3STS)] 003116

The read-only serial I/O3 status register consists of seven flags

(bits 0 to 6) which indicate the operating status of the serial I/O3

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 cleared 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. A write to the serial I/O3

status register clears all the error flags OE, PE, FE, and SE (bit 3

to bit 6, respectively). Writing “0” to the serial I/O3 enable bit SIOE

(bit 7 of the serial I/O3 control register) also clears all the status

flags, including the error flags.

Bits 0 to 6 of the serial I/O3 status register are initialized to “0” at

reset, but if the transmit enable bit (bit 4) of the serial I/O3 control

2) and the transmit buffer empty flag (bit 0) become “1”.

[Transmit Buffer Register 3/Receive Buffer

The transmit buffer register 3 and the receive buffer register 3 are

located at the same address. The transmit buffer is write-only and

the receive buffer is read-only. If a character bit length is 7 bits, the

MSB of data stored in the receive buffer is “0”.

[Baud Rate Generator 3 (BRG3)] 002F16

The baud rate generator determines the baud rate for serial trans-

fer.

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 genera-

tor.

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