M38039G8HKP datasheet(44/92 Pages) RENESAS

44 / 92 page

Rev.1.10

Nov 14, 2005

Page 44 of 91

REJ03B0166-0110

3803 Group (Spec.H QzROM version)

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

[Transmit Buffer Register 1/Receive Buffer Register 1

(TB1/RB1)] 001816

The transmit buffer register 1 and the receive buffer register 1 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”.

[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 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

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

and SE (bit 3 to bit 6, respectively). Writing “0” to the serial I/O1

enable bit SIOE (bit 7 of the serial I/O1 control register) also

clears all the status flags, including the error flags.

Bits 0 to 6 of the serial I/O1 status register are initialized to “0” at

reset, but if the transmit enable bit (bit 4) of the serial I/O1

control register has been set to “1”, the transmit shift completion

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

[Serial I/O1 Control Register (SIO1CON)] 001A16

The serial I/O1 control register consists of eight control bits for

the serial I/O1 function.

[UART1 Control Register (UART1CON)] 001B16

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

always valid and sets the output structure of the P45/TXD1 pin.

[Baud Rate Generator 1 (BRG1)] 001C16

The baud rate generator determines the baud rate for serial

transfer.

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.

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