cp3ub17 National Semiconductor Corporation, cp3ub17 Datasheet - Page 117
cp3ub17
Manufacturer Part Number
cp3ub17
Description
Reprogrammable Connectivity Processor With Usb Interface
Manufacturer
National Semiconductor Corporation
Datasheet
1.CP3UB17.pdf
(202 pages)
- Current page: 117 of 202
- Download datasheet (4Mb)
19.0 Microwire/SPI Interface
Microwire/Plus is a synchronous serial communications
protocol, originally implemented in National Semiconduc-
tor's COP8
mize the number of connections, and therefore the cost, of
communicating with peripherals.
The enhanced Microwire interface module includes the fol-
lowing features:
19.1
The Microwire interface allows several devices to be con-
nected on one three-wire system. At any given time, one of
these devices operates as the master while all other devices
operate as slaves. The Microwire interface allows the device
to operate either as a master or slave transferring 8- or 16-
bits of data.
The master device supplies the synchronous clock (MSK)
for the serial interface and initiates the data transfer. The
slave devices respond by sending (or receiving) the re-
quested data. Each slave device uses the master’s clock for
serially shifting data out (or in), while the master shifts the
data in (or out).
Lines
I/O
Programmable operation as a Master or Slave
Programmable shift-clock frequency (master only)
Programmable 8- or 16-bit mode of operation
8- or 16-bit serial I/O data shift register
Two modes of clocking data
Serial clock can be low or high when idle
16-bit read buffer
Busy bit, Read Buffer Full bit, and Overrun bit for polling
and as interrupt sources
Supports multiple masters
Maximum bit rate of 10M bits/second (master mode) 5M
bits/second (slave mode) at 20 MHz System Clock
Supports very low-end slaves with the Slave Ready out-
put
Echo back enable/disable (Slave only)
MICROWIRE OPERATION
®
and HPC families of microcontrollers to mini-
Master
MDIDO
MDODI
GPIO
MSK
DO
8-Bit
A/D
CS
SK
DI
Figure 34. Microwire Interface
DO
EEPROM
1K Bit
CS
SK
DI
117
The CP3UB17 has an enhanced Microwire/SPI interface
module (MWSPI) that can communicate with all peripherals
that conform to Microwire or Serial Peripheral Interface
(SPI) specifications. This enhanced Microwire interface is
capable of operating as either a master or slave and in 8- or
16-bit mode. Figure 34 shows a typical enhanced Microwire
interface application.
The three-wire system includes: the serial data in signal
(MDIDO for master mode, MDODI for slave mode), the se-
rial data out signal (MDODI for master mode, MDIDO for
slave mode), and the serial clock (MSK).
In slave mode, an optional fourth signal (MWCS) may be
used to enable the slave transmit. At any given time, only
one slave can respond to the master. Each slave device has
its own chip select signal (MWCS) for this purpose.
Figure 35 shows a block diagram of the enhanced Microwire
serial interface in the device.
Display
Driver
LCD
CS
SK
DI
Display
Driver
CS
VF
SK
DI
MWCS
MDIDO
MDODI
MSK
Slave
www.national.com
DS067
I/O
Lines
Related parts for cp3ub17
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
Part Number:
Description:
Freescale Semiconductor Technical Data
Manufacturer:
National Semiconductor Corporation
Datasheet:
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:
Part Number:
Description:
Pllatinum Tm Fractional N Rf / Integer N If Dual Low Power Frequency Synthesizer
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Pllatinum? 2.0 Ghz Frequency Synthesizer For Rf Personal Communications
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Pllatinumtm 160 Mhz Frequency Synthesizer For Rf Personal Communications
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Dual N-channel Enhancement Mode Field Effect Transistor
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Video Amplifier System (obsolete)
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Synchronous Step-up DC/DC Converter For White Led Applications
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
CLC420 - High Speed, Voltage Feedback op Amp, Package: Lcc, Pin Nb=20
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Monolithic Triple 4.5 CRT Driver
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Differential Video Amplifier
Manufacturer:
National Semiconductor Corporation
Datasheet:
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:
Part Number:
Description:
DS36277 - Dominant Mode Multipoint Transceiver, Package: Soic Narrow, Pin Nb=8
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Printer Solenoid Driver
Manufacturer:
National Semiconductor Corporation
Datasheet:
Part Number:
Description:
Quad High Speed Trapezoidal Bus Transceiver
Manufacturer:
National Semiconductor Corporation
Datasheet: