28-24
MB86R02 ‘Jade-D’ Hardware Manual V1.64
OE flag
Operation example of OE flag of bit 1 in the Line status register (LSR) is shown in Figure 28-10.
UART_SI Nx
( DR)
D14
D15
D16
Li ne status
D1
D15
D16
D17
( OE)
APB readi ng
FI FO FULL
D2
Figure 28-10 Operation example of OE flag
When next character is received completely to the Reception shift register in the status that
reception FIFO is full, overrun error occurs. In this case, OE flag of the Line status register is set
immediately and interrupt occurs (if it is permitted.)
DR flag
Operation example of DR flag of bit 0 in the Line status register (LSR) is shown in Figure 28-11.
1 character
Mark state
Start bi t
Pari ty bi t
Data bi t
Stop bi t
UART_SI Nx
( DR)
D0
D1
D2
D3
D4
D5
PT
D0
PT
URTxRFR
regi ster readi ng
Figure 28-11 Operation example of DR flag
When reception data is received and 1 byte or more of data is stored in reception FIFO, DR flag of
the Line status register becomes "1". The flag becomes "0" by reading reception FIFO data and
FIFO becomes empty.
ERRF flag
When error (parity, break detection, and flaming) is included in the data stored in reception FIFO,
ERRF flag of bit 7 of the Line status register (LSR) is set to "1" during reception operation.
If there is no error data in FIFO except the one set ERRF flag when CPU reads the register, this
flag is cleared to "0".
Содержание MB86R02
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