7513 datasheet(31/66 Pages) RENESAS

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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

7513 Group

[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 charac-

ter bit length is 7 bits, the MSB of data stored in the receive buffer

[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/O

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 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. Writ-

ing “0” to the serial I/O1 enable bit (SIOE) also clears all the status

flags, including the error flags.

All bits of the serial I/O1 status register are initialized to “0” at re-

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

tion 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 contains eight control bits for the

serial I/O1 function.

[UART Control Register (UARTCON) ]001B16

This is a 5 bit register containing four control bits, which are valid

when UART is selected and set the data format of an data re-

ceiver/transfer, and one control bit, which is always valid and sets

the output structure of the P45/TXD pin.

[Baud Rate Generator(BRG)] 001616

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.

s Notes

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 synchronized with the transmission en-

abled, take the following sequence.

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

➁ Set the transmit enable bit to “1”.

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

more instructions have been executed.

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

7513 Datasheet(PDF) 31 Page - Renesas Technology Corp

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