參數(shù)資料
型號(hào)： a8251
廠商： Altera Corporation
英文描述： Programmable Communications Interface(可編程通信接口)
中文描述： 可編程通信接口（可編程通信接口）
文件頁(yè)數(shù)： 7/21頁(yè)
文件大小： 338K
代理商： A8251
Altera Corporation
31
a8251 Programmable Communications Interface Data Sheet
Baud Rate Factor
When programmed for synchronous operation, the MIR’s baud rate factor
bits (bit 0 and bit 1) are always a logic low.
Word Length Select
Bits 2 and 3 (
l1
,
l2
) of the MIR are the word length select bits, which are
used to select the word length of the data byte. These bits function
identically when programmed for asynchronous or synchronous
operation.
Parity Select
Bits 4 and 5 (
pen
,
ep
) of the MIR are the parity select bits, which are used
to select the parity options. These bits function identically when
programmed for asynchronous or synchronous operation.
External Sync Detect
When bit 6 (
esd
) of the MIR is high, external sync detection is used by the
a8251
receiver. Otherwise the receiver is responsible for sync detection.
Single Character Sync
When bit 7 (
scs
) of the MIR is high, the receiver looks for a single sync
character before beginning the synchronization process. Otherwise the
receiver looks for two sync characters.
Table 7. Mode Instruction Register Bits (Synchronous Operation)
Data Bit
Bit Name
0
1
2
3
4
5
6
7
Baud rate factor (
b1
)
Baud rate factor (
b2
)
Word length select (
l1
)
Word length select (
l2
)
Parity select (
pen
)
Parity select (
ep
)
External sync detect (
esd
)
Single character sync (
scs
)
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