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Hi EVeryone! X5043 is Xicor's uP Supervisor with 4k bit EEprom. the interface of X5043 is SPI. But if you want to write one byte to an address of X5043. You need first input the instruction(8 bits) then the Address ( 8 bits) and then the Data ( x bits). the 56f807's spi data length is only 16bits. So can't save data in X5043. Right? I am very sad about that. Any way to prevent changing the X5043 from the boards. The other question is if I connect the SCI0's txd and Rxd dirrectly to A 5v CPU's UART rxd and txd. It is supplied with 5v , with the same ground with 56f807. 807's voltage supply is from the same 5v+LDO. the SCI will work without any defects? Anybody has any good Realtime clock chips most suitable for 56F807? Many thanks! Sorry for poor English! Hao

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The SPI can be set up for anywhere from 2 to 16 bits as follows: // Serial Peripheral Interface Data Size Register (SPDSR) values enum dspspi_dsr_values { DSPSPI_DSR_ILLEGAL = 0, DSPSPI_DSR_2_BITS, DSPSPI_DSR_3_BITS, DSPSPI_DSR_4_BITS, DSPSPI_DSR_5_BITS, DSPSPI_DSR_6_BITS, DSPSPI_DSR_7_BITS, DSPSPI_DSR_8_BITS, DSPSPI_DSR_9_BITS, DSPSPI_DSR_10_BITS, DSPSPI_DSR_11_BITS, DSPSPI_DSR_12_BITS, DSPSPI_DSR_13_BITS, DSPSPI_DSR_14_BITS, DSPSPI_DSR_15_BITS, DSPSPI_DSR_16_BITS }; // SPI Status and Control Register (SPSCR) Default value // bit 15 is not used // bit 14 = 0 = Data Shift Order is MSB first // bit 13 = 0 = SPI Receiver Full Bit (read-only) // bit 12 = 0 = Error Interrupt is disabled // bit 11 = 0 = Overflow Bit (read-only) // bit 10 = 0 = Mode Fault Bit (read-only) // bit 9 = 0 = SPI Transmitter Empty Bit (read-only) // bit 8 = 0 = Mode Fault is disabled // bits 7:6 = 3 = Baud Rate Divisor (BD) = 32 // bit 5 = 0 = SPI Receiver Interrupt is disabled // bit 4 = 1 = SPI is in Master mode // bit 3 = 1 = Clock Polarity Bit // bit 2 = 1 = Clock Phase Bit // bit 1 = 0 = SPI is disabled // bit 0 = 0 = SPI Transmit Interrupt is disabled #define DSP_SPI_SCR_DFLT_VAL 0x00DC // SPI Status and Control Register (SPSCR) Serial EEPROM value // bit 15 is not used // bit 14 = 0 = Data Shift Order is MSB first // bit 13 = 0 = SPI Receiver Full Bit (read-only) // bit 12 = 0 = Error Interrupt is disabled // bit 11 = 0 = Overflow Bit (read-only) // bit 10 = 0 = Mode Fault Bit (read-only) // bit 9 = 0 = SPI Transmitter Empty Bit (read-only) // bit 8 = 0 = Mode Fault is disabled // bits 7:6 = 3 = Baud Rate Divisor (BD) = 32 // bit 5 = 0 = SPI Receiver Interrupt is disabled // bit 4 = 1 = SPI is in Master mode // bit 3 = 1 = Clock Polarity Bit // bit 2 = 1 = Clock Phase Bit // bit 1 = 1 = SPI is enabled // bit 0 = 0 = SPI Transmit Interrupt is disabled #define DSP_SPI_SCR_SERW_VAL 0x00DE // Set up GPIO Port E bits 4-7 to be the SPI Bus signals // SCLK, MOSI, MISO, and /SS. ArchIO.PortE.PeripheralReg |= 0x00F0; // Initialize the DSP chip SPI registers // Status and Control Register (SPI disabled) ArchIO.Spi.ControlReg = DSP_SPI_SCR_DFLT_VAL; // Data Size Register to 8 bits ArchIO.Spi.DataSizeReg = DSPSPI_DSR_8_BITS; // Enable the DSP chip SPI for the Serial EEPROM // Status and Control Register (SPI enabled) ArchIO.Spi.ControlReg = DSP_SPI_SCR_SERW_VAL; The above code works with the Microchip 25AA040, which has the instruction first (8 bits), then the address (8 bits), then the data (8 bits). The I/O pins on the 807 are 5-Volt tolerant, so it will work OK with the 5v CPU's UART rxd and txd. We use the Epson RTC-7301SF Realtime clock chip in our designs, and it works very well for us. Regards, Art Johnson Senior Systems Analyst PMC Prime Mover Controls Inc. 3600 Gilmore Way Burnaby, B.C., Canada V5G 4R8 Phone: 604 433-4644 FAX: 604 433-5570 Email: http://www.pmc-controls.com -----Original Message----- From: hao yuan [mailto:] Sent: Thursday, September 05, 2002 6:59 AM To: Subject: [motoroladsp] 56F807's SPI can't access X5043 Hi EVeryone! X5043 is Xicor's uP Supervisor with 4k bit EEprom. the interface of X5043 is SPI. But if you want to write one byte to an address of X5043. You need first input the instruction(8 bits) then the Address ( 8 bits) and then the Data ( x bits). the 56f807's spi data length is only 16bits. So can't save data in X5043. Right? I am very sad about that. Any way to prevent changing the X5043 from the boards. The other question is if I connect the SCI0's txd and Rxd dirrectly to A 5v CPU's UART rxd and txd. It is supplied with 5v , with the same ground with 56f807. 807's voltage supply is from the same 5v+LDO. the SCI will work without any defects? Anybody has any good Realtime clock chips most suitable for 56F807? Many thanks! Sorry for poor English! Hao _____________________________________ /groups.php3

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Many thanks to Art Johnson, Thanks for your help and all the informations provided. I misunderstood the SPI functions of the 807. It is the first time I use the SPI. The SPI of 807 is double-buffered.There are two registers for transmission. Shift register and Data transmit register. It allows the user to queue up at most a 32-bit value to send once. --- Art Johnson <> wrote: > The SPI can be set up for anywhere from 2 to 16 bits > as follows: > > // Serial Peripheral Interface Data Size Register > (SPDSR) values > enum dspspi_dsr_values { > > DSPSPI_DSR_ILLEGAL = 0, > DSPSPI_DSR_2_BITS, > DSPSPI_DSR_3_BITS, > DSPSPI_DSR_4_BITS, > DSPSPI_DSR_5_BITS, > DSPSPI_DSR_6_BITS, > DSPSPI_DSR_7_BITS, > DSPSPI_DSR_8_BITS, > DSPSPI_DSR_9_BITS, > DSPSPI_DSR_10_BITS, > DSPSPI_DSR_11_BITS, > DSPSPI_DSR_12_BITS, > DSPSPI_DSR_13_BITS, > DSPSPI_DSR_14_BITS, > DSPSPI_DSR_15_BITS, > DSPSPI_DSR_16_BITS > > }; > > // SPI Status and Control Register (SPSCR) Default > value > // bit 15 is not used > // bit 14 = 0 = Data Shift Order is MSB first > // bit 13 = 0 = SPI Receiver Full Bit (read-only) > // bit 12 = 0 = Error Interrupt is disabled > // bit 11 = 0 = Overflow Bit (read-only) > // bit 10 = 0 = Mode Fault Bit (read-only) > // bit 9 = 0 = SPI Transmitter Empty Bit > (read-only) > // bit 8 = 0 = Mode Fault is disabled > // bits 7:6 = 3 = Baud Rate Divisor (BD) = 32 > // bit 5 = 0 = SPI Receiver Interrupt is > disabled > // bit 4 = 1 = SPI is in Master mode > // bit 3 = 1 = Clock Polarity Bit > // bit 2 = 1 = Clock Phase Bit > // bit 1 = 0 = SPI is disabled > // bit 0 = 0 = SPI Transmit Interrupt is > disabled > #define DSP_SPI_SCR_DFLT_VAL 0x00DC > > // SPI Status and Control Register (SPSCR) Serial > EEPROM value > // bit 15 is not used > // bit 14 = 0 = Data Shift Order is MSB first > // bit 13 = 0 = SPI Receiver Full Bit (read-only) > // bit 12 = 0 = Error Interrupt is disabled > // bit 11 = 0 = Overflow Bit (read-only) > // bit 10 = 0 = Mode Fault Bit (read-only) > // bit 9 = 0 = SPI Transmitter Empty Bit > (read-only) > // bit 8 = 0 = Mode Fault is disabled > // bits 7:6 = 3 = Baud Rate Divisor (BD) = 32 > // bit 5 = 0 = SPI Receiver Interrupt is > disabled > // bit 4 = 1 = SPI is in Master mode > // bit 3 = 1 = Clock Polarity Bit > // bit 2 = 1 = Clock Phase Bit > // bit 1 = 1 = SPI is enabled > // bit 0 = 0 = SPI Transmit Interrupt is > disabled > #define DSP_SPI_SCR_SERW_VAL 0x00DE > > // Set up GPIO Port E bits 4-7 to be the SPI Bus > signals > // SCLK, MOSI, MISO, and /SS. > ArchIO.PortE.PeripheralReg |= 0x00F0; > > // Initialize the DSP chip SPI registers > // Status and Control Register (SPI disabled) > ArchIO.Spi.ControlReg = DSP_SPI_SCR_DFLT_VAL; > // Data Size Register to 8 bits > ArchIO.Spi.DataSizeReg = DSPSPI_DSR_8_BITS; > > // Enable the DSP chip SPI for the Serial EEPROM > // Status and Control Register (SPI enabled) > ArchIO.Spi.ControlReg = DSP_SPI_SCR_SERW_VAL; > > The above code works with the Microchip 25AA040, > which has the > instruction first (8 bits), then the address (8 > bits), then the data (8 > bits). > The I/O pins on the 807 are 5-Volt tolerant, so it > will work OK with the > 5v CPU's UART rxd and txd. > We use the Epson RTC-7301SF Realtime clock chip in > our designs, and it > works very well for us. > Regards, > > Art Johnson > Senior Systems Analyst > PMC Prime Mover Controls Inc. > 3600 Gilmore Way > Burnaby, B.C., Canada > V5G 4R8 > Phone: 604 433-4644 > FAX: 604 433-5570 > Email: > http://www.pmc-controls.com > > -----Original Message----- > From: hao yuan [mailto:] > Sent: Thursday, September 05, 2002 6:59 AM > To: > Subject: [motoroladsp] 56F807's SPI can't access > X5043 > Hi EVeryone! > X5043 is Xicor's uP Supervisor with 4k bit EEprom. > the > interface of X5043 is SPI. But if you want to write > one byte to an address of X5043. You need first > input > the instruction(8 bits) then the Address ( 8 bits) > and > then the Data ( x bits). the 56f807's spi data > length > is only 16bits. So can't save data in X5043. Right? > I > am very sad about that. Any way to prevent changing > the X5043 from the boards. > > The other question is if I connect the SCI0's txd > and > Rxd dirrectly to A 5v CPU's UART rxd and txd. It > is > supplied with 5v , with the same ground with 56f807. > 807's voltage supply is from the same 5v+LDO. the > SCI > will work without any defects? > > Anybody has any good Realtime clock chips most > suitable for 56F807? > > > Many thanks! > Sorry for poor English! > Hao > > > _____________________________________ > /groups.php3 __________________________________________________

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