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PCIF0 Folha de dados(PDF) 239 Page - ATMEL Corporation

Nome de Peças PCIF0
Descrição Electrónicos  High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture
PDF  294 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

PCIF0 Folha de dados(HTML) 239 Page - ATMEL Corporation

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239
9219A–RFID–01/11
Atmel ATA5505 [Preliminary]
22.4
Calibration Byte
The Atmel
® AVR® has a byte calibration value for the internal RC Oscillator. This byte resides
in the high byte of address 0x000 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.
22.5
Page Size
22.6
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 Atmel AVR. Pulses are assumed to be
at least 250 ns unless otherwise noted.
22.6.1
Signal Names
In this section, some pins of the Atmel AVR are referenced by signal names describing their
functionality during parallel programming, see Figure 22-1 and Figure 22-9. 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 positive
pulse. The bit coding is shown in Figure 22-11.
When pulsing WR or OE, the command loaded determines the action executed. The different
commands are shown in Figure 22-12.
Table 22-7.
Number of Words in a Page and No. of Pages in the Flash
Device
Flash Size
Page Size
PCWORD
No. of Pages
PCPAGE
PCMSB
Atmel AVR
8K words
64words
PC[5:0]
128
PC[12:6]
12
Table 22-8.
Number of Words in a Page and No. of Pages in the EEPROM
Device
EEPROM Size
Page Size
PCWORD
No. of Pages
PCPAGE
EEAMSB
Atmel AVR
512bytes
4bytes
EEA[1:0]
128
EEA[8:2]
8



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