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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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TP3465V Arkusz danych(PDF) 7 Page - National Semiconductor (TI) |
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TP3465V Arkusz danych(HTML) 7 Page - National Semiconductor (TI) |
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7 / 17 page  Functional Description (Continued) Example 1 Communicating with 8-bit peripheraldevice 0 The mwm0 bit must be set to 0 Write the MICROWIRE data in to the FMBD0 address The 8-bit data is then shifted out after the trailing edge of the write pulse The Chip Select (CS0) is automatically activated (LOW) and deactivated (HIGH) by hardware before and after the data transfer (see timing diagrams) The 8-bit STATUS from the peripheral is read from the FMBD0 byte location Example 2 Communicating with 16-bit peripheraldevice 0 The mwm0 bit must be set to 1 Write the LOW byte of MICROWIRE data into the SMB data register and then write the HIGH byte in to the FMBD0 address The 16-bit data is then shifted out after the trailing edge of the write strobe signal for this FMBD0 address The Chip Select 0 (CS0) pin is automatically activated (LOW) and deactivated (HIGH) by hardware before and after the data transfer (see timing dia- grams) The 16-bit STATUS from the peripheral is read from the FMBD0 (HIGH data byte) and the SMB (LOW data byte) locations FMBD1First MICROWIRE Byte Dev1 RW Register Same function as FMBD0 except this refers to Device 1 and Chip Select 1 (CS1) FMBD2First MICROWIRE Byte Dev2 RW Register Same function as FMBD0 except this refers to Device 2 and Chip Select 2 (CS2) FMBD3First MICROWIRE Byte Dev3 RW Register Same function as FMBD0 except this refers to Device 3 and Chip Select 3 (CS3) FMBD4First MICROWIRE Byte Dev4 RW Register Same function as FMBD0 except this refers to Device 4 and Chip Select 4 (CS4) FMBD5First MICROWIRE Byte Dev5 RW Register Same function as FMBD0 except this refers to Device 5 and Chip Select 5 (CS5) FMBD6First MICROWIRE Byte Dev6 RW Register Same function as FMBD0 except this refers to Device 6 and Chip Select 6 (CS6) FMBD7First MICROWIRE Byte Dev7 RW Register Same function as FMBD0 except this refers to Device 7 and Chip Select 7 (CS7) MICROWIRE MasterSlave Modes MICROWIRE MASTER MODE The primary application for MID is as a master of MICRO- WIRE bus (ms bit in CKR register set to 0) and as such it provides the SK clock out to the peripheral devices It trans- mits data on the SO pin and receives data on the SI pin The CS0 – 7 pins are used as chip select pins for the peripherals and have a predefined relationship with the SK clock output Writing to the FMB pin causes the most significant bit to be output immediately to the SO pin and the uwdone bit is automatically reset to 0 Upon completion of transfer of ei- ther 8 bits (mwm7 e 0) or 16 bits (mwm7 e 1) the uwdone bit is set to 1 The SO pin is then set to the TRI- STATE condition Note that when using the FMB and SMB registers the communication mode is determined by the pa- rameters for channel 7 (mwm7 and skp7) MICROWIRE SLAVE MODE The MID can be set to work in MICROWIRE Slave mode by setting the ms bit to 1 The MICROWIRE clock from the master is connected to the CKIN pin of this MID device The SK output is ignored Normally the SO pin is in TRI-STATE condition and while the uwdone bit is 1 any CKIN clock inputs are ignored Writing to the FMB register causes the most significant bit to be output immediately to the SO pin and the uwdone bit is reset to 0 by hardware The SK clock input is then enabled to clock data into SI and out of SO After receiving SK clock pulses either 8 (mwm7 e 0) or 16 bits (mwm7 e 1) the uwdone bit is set to 1 by hardware The SO pin is then set to TRI-STATE condition Note that when using the FMB and SMB registers the communication mode is determined by the parameters of channel 7 (mwm7 and skp7) FMBD0 – 7 addresses are not used in the slave mode The CS register however can be used as a general IO port control register See applications section for an example of the Slave opera- tion (Figure 6) MICROWIRE BUS FORMATS MID supports devices which implement either of the two MICROWIRE bus formats a 3-pin format and a 4-pin format Figure 3 shows a MID connected to devices supporting each of these formats The standard 4-pin format consists of the CCLK clock pin CO and CI as the data out and data in pins and CS to select the MICROWIRE peripheral ISDN transceivers and other intelligent peripherals also have an INTerrupt signal from the peripheral to the local microprocessor NSC MICRO- WIRE devices with this 4-pin format include ISDN transceiv- ers COMBO II LCD display drivers and EEPROMs There are however some MICROWIRE peripherals (eg TP3071 COMBO II and some EEPROMs) which support a 3-pin bus format because of package pin limitations The format consists of the CCLK clock signal a bi-directional data signal COCI and a CS chip select signal The direc- tion of the data transferred on the COCI pin is determined by a protocol between the Master and the Slave of the MI- CROWIRE bus For example the TP3071 implements a two-byte protocol The first byte into the TP3071 indicates a Read or a Write operation and thus defines the direction of the next byte to the device Software Driver Procedures This section describes the steps for software driver routines to communicate with different MICROWIRE devices (8-bit 16-bit or more) and those supporting the 3-pin or 4-pin MICROWIRE bus formats INITIALIZATION 1 Write to PD (Pin Definition) register to set the desired chip select control pins (CS0 – 7) as outputs (All CS pins are set to inputs on chip RESET) 2 Write to SKP (SK polarity) to select the polarity of the SK clock for each of the MICROWIRE devices connected to CS0 – 7 pins 3 Write to MWM (MICROWIRE Mode) register to select whether 8- or 16-bit devices are attached to the CS0 – 7 pins Devices needing more than 16-bits may still be con- figured as 8-bit mode (if multiple of 8) or 16-bit mode (if multiple of 16 bits) 7 |
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