RM0352 datasheet(120/138 Pages) STMICROELECTRONICS

120 / 138 page

UART (universal asynchronous receive transmit)

RM0352

120/138

DocID024647 Rev 1

12.6

This section describes the UART registers.

Table 114 lists the cross references to individual

registers.

12.6.1

Data register, UARTDR

The UARTDR register is the data register. For words to be transmitted:

•

If the FIFOs are enabled, data written to this location is pushed onto the transmit FIFO.

•

If the FIFOs are not enabled, data is stored in the transmitter holding register (the

bottom word of the transmit FIFO).

The write operation initiates transmission from the UART. The data is prefixed with a start

bit, appended with the appropriate parity bit (if parity is enabled), and a stop bit. The

resultant word is then transmitted.

For received words:

•

If the FIFOs are enabled, the data byte and the 4-bit status (break, frame, parity, and

overrun) is pushed onto the 12-bit wide receive FIFO.

•

If the FIFOs are not enabled, the data byte and status are stored in the receiving

holding register (the bottom word of the receive FIFO).

The received data byte is read by performing reads from the UARTDR register along with

the corresponding status information. The status information can also be read by a read of

the UARTRSR/UARTECR register as shown in

Table 116.

0xFEC

UARTPeriphID3

0x00

UARTPeriphID3 register - see

Section :

UARTPeriphID3 register on page 135

0xFF0

UARTPCellID0

0x0D

UARTPCellID0 register - see

Section : UARTPCellID0

0xFF4

UARTPCellID1

0xF0

UARTPCellID1 register - see

Section : UARTPCellID1

0xFF8

UARTPCellID2

0x05

UARTPCellID2 register - see

Section : UARTPCellID2

0xFFC

UARTPCellID3

0xB1

UARTPCellID3 register - see

Section : UARTPCellID3

The value depends on the revision of the UART. See

Table 133 on page 134.

Table 114. UART register summary (continued)

Offset

Name

Type

Reset

Width

Description

RM0352 Datasheet(PDF) 120 Page - STMicroelectronics

RM0352 Datasheet(HTML) 120 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 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL