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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega128 датащи(PDF) 300 Page - ATMEL Corporation |
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ATmega128 датащи(HTML) 300 Page - ATMEL Corporation |
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300 / 386 page  300 2467S–AVR–07/09 ATmega128 Notes: 1. tWLRH is valid for the Write Flash, Write EEPROM, Write Fuse bits and Write Lock bits commands. 2. tWLRH_CE is valid for the Chip Erase command. Serial Downloading Both the Flash and EEPROM memory arrays can be programmed using the serial SPI bus while RESET is pulled to GND. The serial interface consists of pins SCK, MOSI (input) and MISO (out- put). After RESET is set low, the Programming Enable instruction needs to be executed first before program/erase operations can be executed. NOTE, in Table 127 on page 300, the pin mapping for SPI programming is listed. Not all parts use the SPI pins dedicated for the internal SPI interface. Note that throughout the description about Serial downloading, MOSI and MISO are used to describe the serial data in and serial data out respectively. For ATmega128 these pins are mapped to PDI and PDO. SPI Serial Programming Pin Mapping Even though the SPI Programming interface re-uses the SPI I/O module, there is one important difference: The MOSI/MISO pins that are mapped to PB2 and PB3 in the SPI I/O module are not used in the Programming interface. Instead, PE0 and PE1 are used for data in SPI Program- ming mode as shown in Table 127. tXLPH XTAL1 Low to PAGEL high 0 ns tPLXH PAGEL low to XTAL1 high 150 ns tBVPH BS1 Valid before PAGEL High 67 ns tPHPL PAGEL Pulse Width High 150 ns tPLBX BS1 Hold after PAGEL Low 67 ns tWLBX BS2/1 Hold after WR Low 67 ns tPLWL PAGEL Low to WR Low 67 ns tBVWL BS1 Valid to WR Low 67 ns tWLWH WR Pulse Width Low 150 ns tWLRL WR Low to RDY/BSY Low 0 1 μs tWLRH WR Low to RDY/BSY High (1) 3.7 5 ms tWLRH_CE WR Low to RDY/BSY High for Chip Erase (2) 7.5 10 ms tXLOL XTAL1 Low to OE Low 0 ns tBVDV BS1 Valid to DATA valid 0 250 ns tOLDV OE Low to DATA Valid 250 ns tOHDZ OE High to DATA Tri-stated 250 ns Table 126. Parallel Programming Characteristics, V CC = 5 V ± 10% (Continued) Symbol Parameter Min Typ Max Units Table 127. Pin Mapping SPI Serial Programming Symbol Pins I/O Description MOSI (PDI) PE0 I Serial data in MISO (PDO) PE1 O Serial data out SCK PB1 I Serial clock |
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