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LTC1199CS8 データシート(PDF) 21 Page - Linear Technology |
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LTC1199CS8 データシート(HTML) 21 Page - Linear Technology |
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21 / 28 page  21 LTC1197/LTC1197L LTC1199/LTC1199L S APPLICATI TYPICAL MICROPROCESSOR INTERFACES The LTC1197/LTC1197L/LTC1199/LTC1199L can inter- face directly (without external hardware to most popular microprocessor (MPU) synchronous serial formats (see Table 1). If an MPU without a dedicated serial port is used, then three or four of the MPU’s parallel port lines can be programmed to form the serial link. Included here is one serial interface example and one example showing a parallel port programmed to form the serial interface. Motorola SPI (MC68HC05C4, MC68HC11) The MC68HC05C4 has been chosen as an example of an MPU with a dedicated serial port. This MPU transfers data MSB-first and in 8-bit increments. With two 8-bit trans- fers, the A/D result is read into the MPU. The first 8-bit transfer sends the DIN word to the LTC1199 and clocks the two ADC MSBs (B9 and B8) into the MPU. The second 8- bit transfer clocks the next 8 bits, B7 through B0, of the ADC into the MPU. ANDing the first MPU received byte with 03Hex clears the six MSBs. Notice how the position of the start bit in the DIN word is used to position the A/D result so that it is right- justified in two memory locations. Table 1. Microprocessor with Hardware Serial Interfaces Compatible with the LTC1197/LTC1197L/LTC1199/LTC1199L PART NUMBER TYPE OF INTERFACE Motorola MC6805S2,S3 SPI MC68HC11 SPI MC68HC05 SPI RCA CDP68HC05 SPI Hitachi HD6301 SCI Synchronous HD6303 SCI Synchronous HD6305 SCI Synchronous HD63701 SCI Synchronous HD63705 SCI Synchronous HD64180 CSI/O National Semiconductor COP400 Family MICROWIRE TM COP800 Family MICROWIRE/PLUS TM NSC8050U MICROWIRE/PLUS HPC16000 Family MICROWIRE/PLUS Texas Instruments TMS7000 Family Serial Port TMS320 Family Serial Port Microchip Technology PIC16C60 Family SPI, SCI Synchronous PIC16C70 Family SPI, SCI Synchronous MICROWIRE and MICROWIRE/PLUS are trademarks of National Semiconductor Corp. |
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