28-22
MB86R02 ‘Jade-D’ Hardware Manual V1.64
FE flag and BI flag
Operation example of BI flag and of bit 4 and 3 and FE flag in the Line status register (LSR) is
shown in Figure 28-8.
1 character
UART_SINx
(FE)
D0
D1
D2
D3
D4
SP
PT
(BI)
UART_SINx
(note)
URTxLSR
Register reading
URTxRFR
Register reading
1 character
D0
D1
D2
D3
D4
SP
PT
D0
D1
D2
D3
D4
SP
PT
Figure 28-8 Operation example of FE flag and BI flag
If "L" level is received at the stop bit during reception operation, flaming error occurs and FE flag
becomes "1". The error flag is reset by reading Line status register.
When "L" level continues during transmission time (start bit, data bit, parity bit, and stop bit) for 1
character, break code is detected. These errors are applied to each data in FIFO, and they are
able to be confirmed when CPU reads the first data of FIFO. FE and BI flags are able to be
confirmed in the Status register at reading Line status register whose first data includes framing
and break detection error. Both flags become "0" by reading Status register.
For the case of break detection error, reception data is stored to FIFO as 0.
When break is detected, macro stops reception, and it restarts the process with detecting SIN's
falling edge.
Содержание MB86R02
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