Table 812. Bdrm Access In Uart Mode - STMicroelectronics SPC572L series Reference Manual

LINFlexD
IPS operation
Write word
Read byte0-1-2-3
Read halfword0-1
Read word
Write byte0-1-2-3
Write halfword0-1
Write word
Read byte0-1-2-3
Read halfword0-1
Read word
1. Halfword0 refers to DATA1 and DATA0 of BDRL register. Halfword1 refers to DATA3 and DATA2 of BDRL register.
Halfword2 refers to DATA5 and DATA4 of BDRM register. Halfword3 refers to DATA7 and DATA6 of BDRM register.
In UART FIFO mode (UARTCR[TFBM] = 1), any read operation causes an IPS transfer
error.
50.3.4.8 UART receiver
The reception of a data byte is started as soon as the user exits Initialization mode, sets the
Rxen bit, and detects the start bit. There is a dedicated 4-byte (if UARTCR[WL1] = 0) or 2-
halfword (if UARTCR[WL1] = 1) data buffer for received data. Once the programmed
number (RDFL bits) of bytes have been received, the DRF flag is set in UARTSR and the
current reception gets completed. Rxen bit needs to be set only to start the reception.The
reception is automatically completed as soon as the programmed number (RDFL bits) of
bytes have been received.
The buffer can be configured in FIFO mode (mandatory when the DMA Rx is enabled) by
setting the control bit UARTCR[RFBM].
IPS operation
Read byte4
Read byte5-6-7
Read halfword2-3
Read word
Read byte4-5-6-7
Read halfword2
Read halfword3
Read word
1436/2058
Table 811. BDRL access in UART mode(Continued)
Mode
Register
(UARTCR[TFBM])
BDRL FIFO
BDRL FIFO
BDRL FIFO
BDRL FIFO
BDRL Buffer
BDRL Buffer
BDRL Buffer
BDRL Buffer
BDRL Buffer
BDRL Buffer

Table 812. BDRM access in UART mode

Mode
Register
(UARTCR[RFBM])
BDRM FIFO
BDRM FIFO
BDRM FIFO
BDRM FIFO
BDRM FIFO
BDRM FIFO
BDRM FIFO
BDRM FIFO
DocID027809 Rev 4
(1)
Word length
(UARTCR:WL)
Halfword IPS transfer error
Byte/halfword IPS transfer error
Byte/halfword IPS transfer error
Byte/halfword IPS transfer error
Byte/halfword OK
Byte/halfword OK
Byte/halfword OK
Byte/halfword OK
Byte/halfword OK
Byte/halfword OK
(1)(2)
Word length
(UARTCR:WL)
Byte OK
Byte IPS transfer error
Byte IPS transfer error
Byte IPS transfer error
Halfword IPS transfer error
Halfword OK
Halfword IPS transfer error
Halfword IPS transfer error
RM0400
IPS operation result
IPS operation result