參數(shù)資料
型號: 20-101-0732
廠商: Rabbit Semiconductor
文件頁數(shù): 69/126頁
文件大小: 0K
描述: INTERFACE SMART SCREEN OP7100
標準包裝: 1
系列: SBC
模塊/板類型: 單板計算機模塊
適用于相關產(chǎn)品: OP7100
其它名稱: 20-101-732
20-101-732-ND
OP7100
Hardware
47
ASCI Control Register A
Control Register A affects various aspects of the asynchronous channel
operation.
CNTLA0
(00H)
7
654
321
0
MPE
RE
TE
/RTS0
MPBR/
EFR
MOD2
MOD1
MOD0
R / W
CNTLA1
(01H)
7
654
321
0
MPE
RE
TE
CKA1D
MPBR/
EFR
MOD2
MOD1
MOD0
R / W
MOD0–MOD2 (Data Format Mode Bits)
MOD0 controls stop bits: 0
1 stop bit, 1 2 stop bits. If 2 stop bits are
expected, then 2 stop bits must be supplied.
MOD1 controls parity: 0
parity disabled, 1 parity enabled. (See PEO
in ASCI Control Register B for even/odd parity control.)
MOD2 controls data bits: 0
7 data bits, 1 8 data bits.
MPBR/EFR (Multiprocessor Bit Receive/Error Flag Reset)
Reads and writes on this bit are unrelated. Storing a byte when this bit is 0
clears all the error flags (OVRN, FE, PE). Reading this bit obtains the
value of the MPB bit for the last read operation when the multiprocessor
mode is enabled.
/RTS0 (Request to Send, Channel 0)
Store a 1 in this bit to set the RTS0 line from the Z180 high. This bit is
essentially a 1-bit output port without other side effects.
CKA1D (CKA1 Disable)
This bit controls the function assigned to the multiplexed pin (CKA1/
~TEND0): 1
~TEND0 (a DMA function) and 0 CKA1 (external
clock I/O for Channel 1 serial port).
TE (Transmitter Enable)
This bit controls the transmitter: 1
transmitter enabled, 0 transmitter
disabled. When this bit is cleared, the processor aborts the operation in
progress, but does not disturb TDR or TDRE.
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