參數(shù)資料
型號(hào)： TL16PC564BLV
廠商： Texas Instruments, Inc.
英文描述： PCMCIA UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER
中文描述： 的PCMCIA通用異步收發(fā)器
文件頁數(shù)： 12/33頁
文件大小： 488K
代理商： TL16PC564BLV
TL16PC564B, TL16PC564BLV
PCMCIA UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER
SLLS225A – MARCH 1996 – REVISED FEBRUARY 1998
12
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
four-and-a-half XIN clock cycles for integer-plus-a-half divisors. Based on the above parameters, the
acceptable XIN/divisor combinations can be derived. The precision of the programmable clock generator for
integer-plus-a-half divisors depends on the closeness to a 50% duty cycle for the XIN input clock.
NOTE
With a divisor less than or equal to 8 (whole number), the UART clock will have a low pulse equal
to one clock cycle of the XIN clock. Caution should be used as noted in the following example.
A 20 MHz clock period yields 50 ns total, including rise time and fall time, if a divisor of less than
or equal to 8 (whole number) is used. This provides a total down period less than 50 ns to the UART
clock, which is less than that which is required for the UART to function properly.
Caution should be used when selecting the XIN and divisor combination.
PGMCLK(0–5) VALUE (HEX)
RESULT
0
(0)
No clock (driven high)
0.5
(1)
Divide-by-1
1
(2)
Divide-by-1
1.5
(3)
Divide-by-1
2
(4) to 31.5 (3F)
Divide-by-2 to divide-by-31.5
subsystem serial-bypass mode
The optional serial-bypass mode is implemented to allow a high-throughput path to/from the host CPU. When
this mode is enabled and subsystem control register bit 7 is high, the serial portion of the UART is bypassed
and the subsystem has direct parallel access to the receiver FIFO (write address 140 hex) and the transmitter
FIFO (read address 140 hex). All host CPU interrupts operate normally except for receiver parity, framing, and
breaking interrupts.
auto-CTS operation
The optional auto-CTS operation is implemented so that the host CPU cannot overflow the modem receive
buffer. Auto-CTS operation is enabled when the subsystem sets MCR (subsystem address 130 hex) bit 5 high.
When enabled, deactivating CTS (high) halts the transmitter section of the UART after it completes the current
transfer. Once CTS is reactivated (low) by the modem, transfers resume. Interrupt operation is not affected by
enabling auto-CTS.
auto-RTS operation
The optional auto-RTS operation is implemented so that the subsystem cannot overflow the receiver FIFO.
Auto-RTS operation is enabled when FCR bit 4 is high and EXTEND is low and operates independently from
the trigger-level circuitry. In the 16-byte FIFO mode, the RTS bit in the modem-control register (bit 1) clears when
14 characters are in the receive FIFO. This action causes RTS to go high (inactive). In the 64-byte FIFO mode,
the MCR RTS bit clears when 56 characters are in the receiver FIFO. Interrupt operation is not affected and
operates the same way in either auto-RTS or nonauto-RTS mode. When enabled, a receive-data-
available interrupt occurs after the trigger level is reached. The MCR RTS bit must then be set by the host CPU
after the receiver FIFO has been read.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TL16PC564BLVI 制造商:TI 制造商全稱:Texas Instruments 功能描述:PCMCIA UNIVERSAL ASYNCHRONOUS RECEIVER TRANSMITTER
TL16PC564BLVIPZ 功能描述:UART 接口集成電路 PCM Universal Async Rcvr Transmitter RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16PC564BLVIPZG4 功能描述:UART 接口集成電路 16-Bit Bus Trnscvr With 3-State Outputs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16PC564BLVPZ 功能描述:UART 接口集成電路 PCMCIA Univ Async Receiver Transmitter RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16PC564BPZ 功能描述:UART 接口集成電路 Sngl UART w/64-Byte FIFOs PCMCIA Ifc RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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