ST62T35B datasheet(58/82 Pages) STMICROELECTRONICS

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ST62T35B/E35B

REGISTERS (Cont’d)

UART Control Register (UARTCR)

Address: D7h, Read/Write

Bit 7 = RXRDY.

Receiver Ready. This flag be-

comes active as soon as a complete byte has

been received and copied into the receive buffer.

It may be cleared by writing a zero to it. Writing a

one is possible. If the interrupt enable bit RXIEN is

set to one, a software interrupt will be generated.

Bit 6 = TXMT.

Transmitter Empty. This flag be-

comes active as soon as a complete byte has

been sent. It may be cleared by writing a zero to it.

It is automatically cleared by the action of writing a

data value into the UART data register.

Bit 5 = RXIEN.

Receive Interrupt Enable. When

this bit is set to 1, the receive interrupt is enabled.

Writing to RXIEN does not affect the status of the

interrupt flag RXRDY.

Bit 4 = TXIEN.

Transmit Interrupt Enable. When

this bit is set to 1, the transmit interrupt is enabled.

Writing to TXIEN does not affect the status of the

interrupt flag TXRDY.

Bit 3-1= BR2..BR0.

Baudrate select. These bits

select the operating baud rate of the UART, de-

pending on the frequency of fOSC. Care should

be taken not to change these bits during commu-

nication as writing to these bits has an immediate

effect.

Bit 0 = DAT9.

Parity/Data Bit 9. This bit represents

the 9th bit of the data character that is received or

transmitted. A write to this bit sets the level for the

bit 9 to be transmitted, so it must always be set to

the correct level before transmission. If used as

parity, the value has first to be calculated by soft-

ware. Reading this bit will return the 9th bit of the

received character.

RXRDY TXMT RXIEN TXIE N

BR2

BR1

BR0

DAT9

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