ATMEGA169 ATMEL [ATMEL Corporation], ATMEGA169 Datasheet - Page 269

• Manufacturer Part Number: ATMEGA169
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Latching of Fuses
Signature Bytes
Calibration Byte
Page Size
Parallel Programming
Parameters, Pin
Mapping, and
Commands
Signal Names
2514P–AVR–07/06
The status of the Fuse bits is not affected by Chip Erase. Note that the Fuse bits are
locked if Lock bit1 (LB1) is programmed. Program the Fuse bits before programming the
Lock bits.
The fuse values are latched when the device enters programming mode and changes of
the fuse values will have no effect until the part leaves Programming mode. This does
not apply to the EESAVE Fuse which will take effect once it is programmed. The fuses
are also latched on Power-up in Normal mode.
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 ATmega169 the signature bytes are:
1. 0x000: 0x1E (indicates manufactured by Atmel).
2. 0x001: 0x94 (indicates 16KB Flash memory).
3. 0x002: 0x05 (indicates ATmega169 device when 0x001 is 0x94).
The ATmega169 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.
Table 121. No. of Words in a Page and No. of Pages in the Flash
Table 122. No. of Words in a Page and No. of Pages in the EEPROM
This section describes how to parallel program and verify Flash Program memory,
EEPROM Data memory, Memory Lock bits, and Fuse bits in the ATmega169. Pulses
are assumed to be at least 250 ns unless otherwise noted.
In this section, some pins of the ATmega169 are referenced by signal names describing
their functionality during parallel programming, see Figure 119 and Table 123. 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 125.
When pulsing WR or OE, the command loaded determines the action executed. The dif-
ferent Commands are shown in Table 126.
8K words (16K bytes)
EEPROM Size
Flash Size
512 bytes
Page Size
Page Size
64 words
4 bytes
PCWORD
PCWORD
EEA[1:0]
PC[5:0]
No. of Pages
No. of Pages
128
128
ATmega169/V
PCPAGE
EEA[8:2]
PCPAGE
PC[12:6]
EEAMSB
PCMSB
12
8
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