308
2552K–AVR–04/11
ATmega329/3290/649/6490
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.
27.7
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
mapping for SPI programming is listed. Not all parts use the SPI pins dedicated for the internal
SPI interface.
27.7.1
Serial Programming Pin Mapping
Figure 27-10. Serial Programming and Verify
(1) Notes:
1. If the device is clocked by the internal Oscillator, it is no need to connect a clock source to the
XTAL1 pin.
2. V
CC - 0.3V < AVCC < VCC + 0.3V, however, AVCC should always be within 1.8 - 5.5V
When programming the EEPROM, an auto-erase cycle is built into the self-timed programming
operation (in the Serial mode ONLY) and there is no need to first execute the Chip Erase
instruction. The Chip Erase operation turns the content of every memory location in both the
Program and EEPROM arrays into 0xFF.
Depending on CKSEL Fuses, a valid clock must be present. The minimum low and high periods
for the serial clock (SCK) input are defined as follows:
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 27-12. Parallel Programming Characteristics, V
CC = 5V ± 10% (Continued)
Symbol
Parameter
Min
Typ
Max
Units
Table 27-13. Pin Mapping Serial Programming
Symbol
Pins
I/O
Description
MOSI
PB2
I
Serial Data in
MISO
PB3
O
Serial Data out
SCK
PB1
I
Serial Clock
VCC
GND
XTAL1
SCK
MISO
MOSI
RESET
+1.8 - 5.5V
AVCC
+1.8 - 5.5V
(2)