デザイン・ファイル
完全な内訳を受け取ります。 製品の設置面積などについては、 eCad ファイル.
Quad Universal Asynchronous Receiver/Transmitter (QUART)
- このページには、製造中止（生産終了）となった製品の情報が記載されています。本ページに記載されている仕様および情報は、過去の参考情報です。
The 28C94 quad universal asynchronous receiver/transmitter (QUART) combines four enhanced Philips Semiconductors industry-standard UARTs with an innovative interrupt scheme that can vastly minimize host processor overhead. It is implemented using Philips Semiconductor's high-speed CMOS process that combines small die size and cost with low power consumption.
The operating speed of each receiver and transmitter can be selected independently at one of eighteen fixed baud rates, a 16X clock derived from a programmable counter/timer, or an external 1X or 16X clock. The baud rate generator and counter/timer can operate directly from a crystal or from external clock inputs. The ability to independently program the operating speed of the receiver and transmitter make the QUART particularly attractive for dual-speed channel applications such as clustered terminal systems.
Each receiver is buffered with eight character FIFOs (first-in-first-out memories) and one shift register to minimize the potential for receiver overrun and to reduce interrupt overhead in interrupt driven systems. In addition, a handshaking capability is provided to disable a remote UART transmitter when the receiver buffer is full (RTS control).
The 28C94 provides a power-down mode in which the oscillator is stopped and the register contents are stored. This results in reduced power consumption on the order of several magnitudes. The QUART is fully TTL compatible and operates from a single +5V power supply.
sot238-2_3d
製品詳細
Features
Key Features
- New low overhead interrupt control
- All commercial parts meet industrial timing and temperature parameters
- Four Philips Semiconductors industry-standard UARTs
- Eight byte receive FIFO and eight byte transmit FIFO for each UART
- Parity, framing, and overrun error detection
- False start bit detection
- Line break detection and generation
- Programmable channel mode: normal (full-duplex), automatic echo, local loop back, remote loopback
- Programmable interrupt priorities
- Identification of highest priority interrupt
- Global interrupt register set provides data from interrupting channel
- Vectored interrupts with programmable vector format
- IACKN and programmable DTACKN signals
- Built-in baud rate generator with choice of 18 rates
- Four I/O pins per UART for modem controls, clocks, etc.
- Power down mode
- High-speed CMOS technology
- 52-pin PLCC package
- Commercial and industrial temperature ranges available
- On-chip crystal oscillator
- TTL compatible
- Single +5 V power supply with low power mode
- Two multifunction programmable 16-bit counter/timers
- 1MHz 16x mode operation
- 10ns data bus release time
- "Watch Dog" timer for each receiver
Programmable Data Format
- 5 to 8 data bits plus parity
- Odd, even, no parity or force parity
- 1, 1.5 or 2 stop bits programmable in 1/16-bit increments
Baud Rate for the Receiver and Transmitter Selectable
- 23 fixed rates: 50 to 230.4K baud; Non-standard rates to 1.0 M baud
- User-defined rates from the programmable counter/timer associated with each of two blocks
- External 1x or 16x clock
購入/パラメータ
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ドキュメント
クイック・リファレンス ドキュメンテーションの種類.
1-5 の 11 ドキュメント
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アプリケーション・ノート
Application of UART in GPS navigation system
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アプリケーション・ノート
AN10319
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アプリケーション・ノート
UART to Bluetooth interfacing
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アプリケーション・ノート
AN10320
