The MCU microprocessor (AT90S853 operates through port B work of FLASH - memories of DD1 As in the processor there is a hardware support of the SPI protocol, the memory chip working under this protocol directly is connected to conclusions of the microcontroller DD2 miso, mosi, sck.
The battery for power supply of the device is connected to the X1 socket. C1 and C2 condensers serve for smoothing of pulsations on power-supply circuit which can arise at course of dynamic processes in chips.
As a control unit the microcontroller of RISC architecture of the AVR series of Atmel AT90S853 firm is chosen It possesses the built-in memory of programs of 4096 words and memory of these 512 bytes. Any its command is executed for 1 step of a. Clock frequency is 8 MHz.
The AT45DB321 is a serial-interface Flash memory suitable for in-system reprogramming. Its 34,603,008 bits of memory are organized as 8192 pages of 528 bytes each. In addition to the main memory, AT45DB321 also contains two SRAM data buffers of 528 bytes each. The buffers allow receiving of data while a page in the main memory is being reprogrammed
The block of output chains connects information communication with the TsAP block which in turn connects information communication with the block of non-volatile memory and the operating communications with the clock generator and block of the controler of record/reading.
For data recording in the buffer, the #CS line is transferred to a low state and the operational This code 0x8 is loaded into DataFlash follows 14 bits which are not making sense and the 10-bit address of situation in the buffer. Then are entered 8-bit data.
The block of entrance chains connects information communication with the ATsP block which in turn connects information communication with the block of non-volatile memory and the operating communications with the clock generator and block of the controler of record/reading.
Memory size pays off as follows: As 8000 counting on 8 bits that makes 8 kb registers every second, within an hour we will need to write down 3600 X 8 kb that will make about 29 Mb. Thus, having applied memory capacity 32mb, we will provide the necessary time of record. When using algorithms of archiving, the volume of the written-down information if necessary can be increased.
Characteristics of the device: the self-contained unit with battery food, time of record of 60 minutes. Provides long-term storage of the written-down information at switching off of power supply of the device. There is an of operating modes of a digital dictophone, and also governing bodies of the device modes.
Modern dictophones as data carriers use digital modules of memory. The resource of modules of memory even at the most intensive use will make not less than several years. In such models there is no difficult tape drive mechanism.
For achievement of frequency of selection of 1686 Hz, selection has to happen each 510 cycles (1686 Hz x 510 = 8 MHz). For receiving one result of ATsP, ATsP need to start each 510 cycles in the mode of single transformation with coefficient of division of frequency 3 Single transformation occupies 14 cycles ATsP. Therefore transformation will be ready after 14 x 32 = 448 cycles.