28-23
MB86R02 ‘Jade-D’ Hardware Manual V1.64
PE flag
Operation example of PE flag of bit 2 in the Line status register (LSR) is shown in Figure 28-9.
1 character
Mark state
Start bi t
Pari ty bi t
Data bi t
Stop bi t
UART_SI Nx
Normal compl eti on
1
0
1
0
1
0
1
D0
PT
( PE-FI FO)
URTxLSR
regi ster readi ng
Abnormal compl eti on
D0
D1
D2
D3
D4
D5
PT
UART_SI Nx
1
0
0
0
1
0
1
D0
PT
D0
D1
D2
D3
D4
D5
PT
( PE)
Figure 28-9 Operation example of PE flag (setting even parity)
Parity bit is set to "1" or "0" depending on the number of "1" level bit in the 1 data bit. When it is
set to even parity with EPS in the Line control register, the bit is set to "1" or "0" to have total data
bit and "1" level parity bit even number. Likewise, when parity bit is set to odd parity, total
number of "1" level is set to be odd number.
On reception side, the number of "1" level bit of 1 data including input parity bit is counted, and
polarity of the parity set with EPS bit in the Line control register is compared.
For their discrepancy, PE flag of the register becomes "1" by the judgment that problem occurred
in transmitting data. Then the flag becomes "0" by reading the Line status register. This error is
applied to each data in FIFO, and is able to be confirmed when CPU reads first data of FIFO.
Содержание MB86R02
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