M37542F4SP datasheet(49/122 Pages) RENESAS

49 / 122 page

7542 Group

Rev.3.03

Jul 11, 2008

Page 49 of 117

REJ03B0006-0303

[Transmit buffer register 1/receive buffer register 1 (TB1/

RB1)] 001816

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

cated 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 reg-

ister, and the receive buffer full flag is set. A write to the 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 of the serial I/O1 control regis-

ter 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 UART1 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 P11/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.

■ Notes on Serial I/O1

• Serial I/O interrupt

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

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

the interrupt occurrence synchronized with the transmission en-

abled, take the following sequence.

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

➁ Set the transmit enable bit to “1”.

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

more instructions have been executed.

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

• I/O pin function when serial I/O1 is enabled.

The functions of P12 and P13 are switched with the setting values

of a serial I/O1 mode selection bit and a serial I/O1 synchronous

clock selection bit as follows.

(1) Serial I/O1 mode selection bit → “1” :

Clock synchronous type serial I/O is selected.

Setup of a serial I/O1 synchronous clock selection bit

“0” : P12 pin turns into an output pin of a synchronous clock.

“1” : P12 pin turns into an input pin of a synchronous clock.

Setup of a SRDY1 output enable bit (SRDY)

“0” : P13 pin can be used as a normal I/O pin.

“1” : P13 pin turns into a SRDY1 output pin.

(2) Serial I/O1 mode selection bit → “0” :

Clock asynchronous (UART) type serial I/O is selected.

Setup of a serial I/O1 synchronous clock selection bit

“0”: P12 pin can be used as a normal I/O pin.

“1”: P12 pin turns into an input pin of an external clock.

When clock asynchronous (UART) type serial I/O is selected, it is

P13 pin. It can be used as a normal I/O pin.

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