參數(shù)資料
型號(hào)： SC68C198
廠商： NXP Semiconductors N.V.
英文描述： Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 50 psi, Absolute, Cell with body o-ring, 10 Vdc excitation
中文描述： 八路與TTL兼容的UART在3.3V和5V電源電壓
文件頁(yè)數(shù)： 15/49頁(yè)
文件大?。?/td> 358K
代理商： SC68C198
Philips Semiconductors
Product specification
SC26C198 SC68C198
SC26L198 SC68L198
Octal UART with TTL compatibility at 3.3V
and 5V supply voltages
1995 May 1
350
activity of the Xon/Xoff logic is initiated by commands to the CRx
command forces the transmitter to disable exactly as though an Xoff
character had been received by the RxFIFO. The transmitter will
remain disabled until the chip is reset or the CR(7:3) = 10110 (Xoff
resume) command is given. In particular, reception of an Xon or
disabling or re–enabling the transmitter will
NOT
cause resumption
of transmission. Redundant CRTXon/off commands, i.e. CRTXon
CRTXon, are harmless, although they waste time. A CRTXon may
be used to cancel a CRTXoff (and vice versa), but both may be
transmitted depending on the timing with the transmit state machine.
The kill CRTX command can be used to cleanly terminate any
CRTX commands pending with the minimum impact on the
transmitter.
Note: In
no
case will an Xon/Xoff character transmission be aborted.
Once the character is loaded into the TX Shift Register, transmission
continues until completion or a chip reset is encountered.
The kill CRTX command has no effect in either of the Auto modes.
Mode control
Xon/Xoff mode control is accomplished via the MR0. Bits 3 and 2
reset to zero resulting in all Xon/Xoff processing being disabled. If
MR0[2] is set, the transmitter may be gated by Xon/Xoff characters
received. If MR0[3] is set, the transmitter will transmit Xon and Xoff
when triggered by attainment of fixed fill levels in the channel
RxFIFO. The MR0[7] bit also has an Xon/Xoff function control. If
this bit is set, a received Xon or Xoff character is not pushed into the
RxFIFO. If cleared, the power–on and reset default, the received
Xon or Xoff character is pushed onto the RxFIFO for examination by
the host CPU. The MR0(7) function operates regardless of the
value in MR0(3:2)
Xon/Xoff Interrupts
The Xon/Xoff logic generates interrupts
only
in response to
recognizing either of the characters in the XonCR or XoffCR (Xon or
Xoff Character Registers). The transmitter activity initiated by the
Xon/Xoff logic or any CR command does
not
generate an interrupt.
The character comparators operate regardless of the value in
MR0(3:2). Hence the comparators may be used as general purpose
character detectors by setting MR0(3:2)=’00’ and enabling the
Xon/Xoff interrupt in the IMR.
The Octal UART can present the
Xon/Xoff recognition event
to the
interrupt arbiter for IRQN generation. The IRQN generation may be
masked by setting bit 4 of the Interrupt Mask Register, IMR. The bid
level of an Xon/Xoff recognition event is controlled by the Bidding
Control Register X, BCRX, of the channel. The interrupt status can
be examined in ISR[4]. If cleared, no Xon/Xoff recognition event is
interrupting. If set, an Xon or Xoff recognition event has been
detected. The X Interrupt Status Register, XISR, can be read for
details of the interrupt and to examine other, non–interrupting, status
of the Xon/Xoff logic. Refer to the XISR in the Register
Descriptions.
The character recognition function and the associated interrupt
generation is disabled on hardware or software reset
.
相關(guān)PDF資料
PDF描述
SC68C198A1A Octal UART with TTL compatibility at 3.3V and 5V supply voltages
SC68C198C1A Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 50 psi, Absolute, flush mount, 10 Vdc excitation
SC68L198 Octal UART with TTL compatibility at 3.3V and 5V supply voltages
SC68L198A1A Pressure Transducer, Series 19 mm, Compensated, Pressure Range: 0 psi to 50 psi, Gage, flush mount with flange, 10 Vdc excitation
SC68L198C1A Octal UART with TTL compatibility at 3.3V and 5V supply voltages
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SC68C198A1A 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Octal UART with TTL compatibility at 3.3V and 5V supply voltages
SC68C198C1A 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Octal UART with TTL compatibility at 3.3V and 5V supply voltages
SC68C2550B 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:5 V, 3.3 V and 2.5 V dual UART, 5 Mbit/s (max.), with 16-byte FIFOs and 68 mode mP interface
SC68C2550BIB48 功能描述:UART 接口集成電路 2.5V-5V 2CH UART 16B FIFO MOT 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
SC68C2550BIB48,128 功能描述:UART 接口集成電路 2.5V-5V 2CH UART 16B 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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