cp3cn23 National Semiconductor Corporation, cp3cn23 Datasheet - Page 144
![no-image](/images/no-image-200.jpg)
cp3cn23
Manufacturer Part Number
cp3cn23
Description
Cp3cn23 Reprogrammable Connectivity Processor With Dual Can Interfaces
Manufacturer
National Semiconductor Corporation
Datasheet
1.CP3CN23.pdf
(246 pages)
- Current page: 144 of 246
- Download datasheet (3Mb)
www.national.com
UBKD
URB9
UXMIP
20.3.8
The UnICTRL register is a byte-wide register that contains
the receive and transmit interrupt status bits (read-only bits)
and the interrupt enable bits (read/write bits). The register is
initialized to 01h at reset. The register format is shown be-
low.
UTBE
URBF
UDCTS
UEEI UERI UETI UEFCI UCTS UDCTS URBF UTBE
7
UART Interrupt Control Register (UnICTRL)
6
The Break Detect bit indicates when a line
break condition occurs. This condition is de-
tected if RXD remains low for at least ten bit
times after a missing stop bit has been detect-
ed at the end of a frame. The hardware auto-
matically clears the UBKD bit on reading the
UnSTAT register, but only if the break condi-
tion on RXD no longer exists. If reading the
UnSTAT register does not clear the UBKD bit
because the break is still actively driven on
the line, the hardware clears the bit as soon as
the break condition no longer exists (when the
RXD input returns to a high level).
0 – No break condition occurred.
1 – Break condition occurred.
The Received 9th Data Bit holds the ninth
data bit, when the UART is configured to op-
erate in the 9-bit data format.
The Transmit In Progress bit indicates when
the UART is transmitting. The hardware sets
this bit when the UART is transmitting data
and clears the bit at the end of the last frame
bit.
0 – UART is not transmitting.
1 – UART is transmitting.
The Transmit Buffer Empty bit is set by hard-
ware when the UART transfers data from the
UnTBUF register to the transmit shift register
for transmission. It is automatically cleared by
the hardware on the next write to the UnTBUF
register.
0 – Transmit buffer is loaded.
1 – Transmit buffer is empty.
The Receive Buffer Full bit is set by hardware
when the UART has received a complete data
frame and has transferred the data from the
receive shift register to the UnRBUF register.
It is automatically cleared by the hardware
when the UnRBUF register is read.
0 – Receive buffer is empty.
1 – Receive buffer is loaded.
The Delta Clear To Send bit indicates whether
the CTS input has changed state since the
CPU last read this register. This functionality
is only available for the UART0 module.
0 – No change since last read.
1 – State has changed since last read.
5
4
3
2
1
0
144
UCTS
UEFCI
UETI
UERI
UEEI
20.3.9
The UnOVR register is a byte-wide, read/write register that
specifies the oversample rate. At reset, the UnOVR register
is cleared. The register format is shown below.
UOVSR
7
UART Oversample Rate Register (UnOVR)
Reserved
The Clear To Send bit indicates the state on
the CTS input. This functionality is only avail-
able for the UART0 module.
0 – CTS input is high.
1 – CTS input is low.
The Enable Flow Control Interrupt bit controls
whether a flow control interrupt is generated
when the UDCTS bit changes from clear to
set. This functionality is only available for the
UART0 module.
0 – Flow control interrupt disabled.
1 – Flow control interrupt enabled.
The Enable Transmitter Interrupt bit, when
set, enables generation of an interrupt when
the hardware sets the UTBE bit.
0 – Transmit buffer empty interrupt disabled.
1 – Transmit buffer empty interrupt enabled.
The Enable Receiver Interrupt bit, when set,
enables generation of an interrupt when the
hardware sets the URBF bit.
0 – Receive buffer full interrupt disabled.
1 – Receive buffer full interrupt enabled.
The Enable Receive Error Interrupt bit, when
set, enables generation of an interrupt when
the hardware sets the UERR bit in the Un-
STAT register.
0 – Receive error interrupt disabled.
1 – Receive error interrupt enabled.
The Oversampling Rate field specifies the
oversampling rate, as given in the following ta-
ble.
UOVSR3:0
0000–0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
4
3
Oversampling Rate
UOVSR
16
10
11
12
13
14
15
7
8
9
0
Related parts for cp3cn23
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![mma1270keg](/images/no-image3.png)
Part Number:
Description:
Freescale Semiconductor Technical Data
Manufacturer:
National Semiconductor Corporation
Datasheet:
![ADC12034](/images/no-image3.png)
Part Number:
Description:
Self-calibrating 12-bit Plus Sign Serial I/o A/d Converters With Mux And Sample/hold
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LMX2350](/images/no-image3.png)
Part Number:
Description:
Pllatinum Tm Fractional N Rf / Integer N If Dual Low Power Frequency Synthesizer
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LMX2324](/images/no-image3.png)
Part Number:
Description:
Pllatinum? 2.0 Ghz Frequency Synthesizer For Rf Personal Communications
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LMX2301](/images/no-image3.png)
Part Number:
Description:
Pllatinumtm 160 Mhz Frequency Synthesizer For Rf Personal Communications
Manufacturer:
National Semiconductor Corporation
Datasheet:
![NDS8963](/images/no-image3.png)
Part Number:
Description:
Dual N-channel Enhancement Mode Field Effect Transistor
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LM1201](/images/no-image3.png)
Part Number:
Description:
Video Amplifier System (obsolete)
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LM3501TL-16](/images/no-image3.png)
Part Number:
Description:
Synchronous Step-up DC/DC Converter For White Led Applications
Manufacturer:
National Semiconductor Corporation
Datasheet:
![AD9621](/images/no-image3.png)
Part Number:
Description:
CLC420 - High Speed, Voltage Feedback op Amp, Package: Lcc, Pin Nb=20
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LM2403](/images/no-image3.png)
Part Number:
Description:
Monolithic Triple 4.5 CRT Driver
Manufacturer:
National Semiconductor Corporation
Datasheet:
![LM592M](/images/no-image3.png)
Part Number:
Description:
Differential Video Amplifier
Manufacturer:
National Semiconductor Corporation
Datasheet:
![ADC10061](/images/no-image3.png)
Part Number:
Description:
ADC10061 - 10-Bit 600 NS A/D Converter With Input Multiplexer And Sample/Hold, Package: Soic Wide, Pin Nb=20
Manufacturer:
National Semiconductor Corporation
Datasheet:
![DS36277TMX](/images/no-image3.png)
Part Number:
Description:
DS36277 - Dominant Mode Multipoint Transceiver, Package: Soic Narrow, Pin Nb=8
Manufacturer:
National Semiconductor Corporation
Datasheet:
![DS3654](/images/no-image3.png)
Part Number:
Description:
Printer Solenoid Driver
Manufacturer:
National Semiconductor Corporation
Datasheet:
![DS3662](/images/no-image3.png)
Part Number:
Description:
Quad High Speed Trapezoidal Bus Transceiver
Manufacturer:
National Semiconductor Corporation
Datasheet: