A8251 データシートの表示（PDF） - Altera Corporation

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A8251

Programmable Communications Interface

Altera Corporation 

a8251 Programmable Communications Interface Data Sheet

Table 4. Word Length Select Bits

l2

l1

0

0

0

1

1

0

1

1

Word Length

5

6

7

8

Parity Select

Bits 4 and 5 (pen, ep) of the MIR are the parity select bits, which are used

to select the parity options. Table 5 shows the logic level of the parity

select bits and the corresponding parity.

Table 5. Parity Select Bits

ep

pen

0

0

0

1

1

0

1

1

Parity

None

Odd

None

Even

Stop Bit Select

Bits 6 and 7 (s1, s2) of the MIR are the stop bit select bits, which are used

to determine the number of stop bits. Table 6 shows the logic level of the

stop bit select bits and the corresponding number of stop bits.

Table 6. Stop Bit Select BIts

s2

s1

0

0

0

1

1

0

1

1

Number of Stop Bits

Invalid

1

1.5

2

Synchronous Operation

When the a8251 is programmed for synchronous operation, the MIR

contains the bits shown in Table 7.

30

Altera Corporation

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