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A8251

Programmable Communications Interface

Altera Corporation 

a8251 Programmable Communications Interface Data Sheet

The a8251 contains the following registers:

s Mode instruction

s Command instruction

s Status

s Sync character one

s Sync character two

s Transmitter buffer

s Receiver buffer

Mode Instruction Register

The mode instruction register (MIR) supports both synchronous and

asynchronous operation.

Bits 0 and 1 of the MIR are the baud rate factor bits and determine the ratio

between the data rate and the clocks. If bits 0 and 1 are set to a logic low,

then the a8251 is programmed for synchronous operation; otherwise, the

a8251 operates asynchronously.

Asynchronous Operation

When the a8251 is programmed for asynchronous operation, the MIR

contains the bits shown in Table 2.

Table 2. Mode Instruction Register Bits (Asynchronous Operation)

Data Bit

0

1

2

3

4

5

6

7

Signal Name

Baud rate factor (b1)

Baud rate factor (b2)

Word length select (l1)

Word length select (l2)

Parity select (pen)

Parity select (ep)

Stop bit select (s1)

Stop bit select (s2)

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Altera Corporation

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