Rainbow-electronics ATmega128L Uživatelský manuál stáhnout pdf (Strana 282)

282

ATmega128(L)

2467B–09/01

Signature Bytes All Atmel microcontrollers have a three-byte signature code which identifies the device.

This code can be read in both serial and parallel mode, also when the device is locked.

The three bytes reside in a separate address space.

For the ATmega128 the signature bytes are:

1. $000: $1E (indicates manufactured by Atmel)

2. $001: $97 (indicates 128KB Flash memory)

3. $002: $02 (indicates ATmega128 device when $001 is $97)

Calibration Byte The ATmega128 has a byte calibration value for the internal RC Oscillator. This byte

resides in the high byte of address $000 in the signature address space. During reset,

this byte is automatically written into the OSCCAL register to ensure correct frequency

of the calibrated RC oscillator.

Parallel Programming

Parameters, Pin

Mapping, and

Commands

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

EEPROM Data memory, Memory Lock bits, and Fuse bits in the ATmega128. Pulses

are assumed to be at least 250 ns unless otherwise noted.

Signal Names In this section, some pins of the ATmega128 are referenced by signal names describing

their functionality during parallel programming, see

Figure 135 and Table 121. Pins not

described in the following table are referenced by pin names.

The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a posi-

tive pulse. The bit coding is shown in

Table 123.

When pulsing WR

or OE, the command loaded determines the action executed. The dif-

ferent Commands are shown in

Table 124.

Figure 135. Parallel Programming

VCC

+5V

GND

XTAL1

PD1

PD2

PD3

PD4

PD5

PD6

PB7 - PB0 DATA

RESET

PD7

+12 V

BS1

XA0

XA1

RDY/BSY

PAGEL

PA0

BS2

1 2 ... 277 278 279 280 281 282 283 284 285 286 287 ... 330 331

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