Rainbow-electronics ATtiny15L Manual de usuario descargar pdf (Pagina 55)

ATtiny15L

1187E–AVR–06/02

Calibration Byte The ATtiny15L has a one-byte calibration value for the internal RC Oscillator. This byte

resides in the high byte of address $000 in the signature address space. To make use of

this byte, it should be read from this location and written into the normal Flash Program

memory. At start-up, the user software must read this Flash location and write the value

to the OSCCAL Register.

Programming the Flash Atmel’s ATtiny15L offers 1K byte of In-System Reprogrammable Flash Program mem-

ory and 64 bytes of in-System Reprogrammable EEPROM Data memory.

The ATtiny15L is shipped with the On-chip Flash program and EEPROM data memory

arrays in the erased state (i.e., contents = $FF) and ready to be programmed.

This device supports a High-voltage (12V) Serial Programming mode and a Low-voltage

Serial Programming mode. The +12V is used for programming enable only, and no cur-

rent of significance is drawn by this pin (less than 100

µA). The Low-voltage Serial

Programming mode provides a convenient way to download program and data into the

ATtiny15L inside the user’ssystem.

The Program and Data memory arrays in the ATtiny15L are programmed byte-by-byte

in either Programming mode. For the EEPROM, an auto-erase cycle is provided within

the self-timed write instruction in the Low-voltage Serial Programming mode.

During programming, the supply voltage must be in accordance with Table 24.

High-voltage Serial

Programming

This section describes how to program and verify Flash Program memory, EEPROM

Data memory, Lock bits and Fuse bits in the ATtiny15L.

Figure 30. High-voltage Serial Programming

Table 24. Supply Voltage during Programming

Part Low-voltage Serial Programming High-voltage Serial Programming

ATtiny15L 2.7 - 5.5V 4.5 - 5.5V

PB5 (RESET)

PB3

GND

VCC

PB2

PB1

PB0

SERIAL DATA OUTPUT

SERIAL INSTR. INPUT

SERIAL DATA INPUT

SERIAL CLOCK INPUT

11.5 - 12.5V 4.5 - 5.5V

ATtiny15/L

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Rainbow-electronics ATtiny15L Manual de usuario Pagina 55