參數(shù)資料
型號: ST16C654IJ68
廠商: EXAR CORP
元件分類: 微控制器/微處理器
英文描述: 2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
中文描述: 4 CHANNEL(S), 1.5M bps, SERIAL COMM CONTROLLER, PQCC68
封裝: PLASTIC, LCC-68
文件頁數(shù): 27/51頁
文件大小: 968K
代理商: ST16C654IJ68
ST16C654/654D
2.97V TO 5.5V QUAD UART WITH 64-BYTE FIFO
REV. 5.0.0
27
]
ISR[0]: Interrupt Status
Logic 0 = An interrupt is pending and the ISR contents may be used as a pointer to the appropriate interrupt
service routine.
Logic 1 = No interrupt pending (default condition).
ISR[3:1]: Interrupt Status
These bits indicate the source for a pending interrupt at interrupt priority levels (See Interrupt Source
Table 11
).
ISR[4]: Interrupt Status
This bit is enabled when EFR bit-4 is set to a logic 1. ISR bit-4 indicates that the receiver detected a data match
of the Xoff character(s) or a special character.
ISR[5]: Interrupt Status
This bit is enabled when EFR bit-4 is set to a logic 1. ISR bit-5 indicates that CTS# or RTS# has changed state
from a logic low to logic high.
ISR[7:6]: FIFO Enable Status
These bits are set to a logic 0 when the FIFOs are disabled. They are set to a logic 1 when the FIFOs are
enabled.
4.5
FIFO Control Register (FCR) - Write-Only
This register is used to enable the FIFOs, clear the FIFOs, set the transmit/receive FIFO trigger levels, and
select the DMA mode. The DMA, and FIFO modes are defined as follows:
FCR[0]: TX and RX FIFO Enable
Logic 0 = Disable the transmit and receive FIFO (default).
Logic 1 = Enable the transmit and receive FIFOs. This bit must be set to logic 1 when other FCR bits are
written or they will not be programmed.
T
ABLE
11: I
NTERRUPT
S
OURCE
AND
P
RIORITY
L
EVEL
P
RIORITY
ISR R
EGISTER
S
TATUS
B
ITS
S
OURCE
OF
INTERRUPT
L
EVEL
B
IT
-5
B
IT
-4
B
IT
-3
B
IT
-2
B
IT
-1
B
IT
-0
1
0
0
0
1
1
0
LSR (Receiver Line Status Register)
2
0
0
1
1
0
0
RXRDY (Receive Data Time-out)
3
0
0
0
1
0
0
RXRDY (Received Data Ready)
4
0
0
0
0
1
0
TXRDY (Transmit Ready)
5
0
0
0
0
0
0
MSR (Modem Status Register)
6
0
1
0
0
0
0
RXRDY (Received Xoff or Special character)
7
1
0
0
0
0
0
CTS#, RTS# change of state
-
0
0
0
0
0
1
None (default)
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