ST62T32B datasheet(62/86 Pages) STMICROELECTRONICS

62 / 86 page

62/86

ST62T32B ST62E32B

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 communica-

tion as writing to these bits has an immediate ef-

fect.

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

166

ST62T32B データシート(PDF) 62 Page - STMicroelectronics

ST62T32B データシート(HTML) 62 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86

データシートダウンロード