ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 346

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

346
ATmega640/1280/1281/2560/2561
When pulsing WR or OE, the command loaded determines the action executed. The dif-
ferent commands are shown in Table 161.
Figure 138. Parallel Programming
Note:
Table 157. Pin Name Mapping
Table 158. BS2 and BS1 Encoding
BS2
0
Programming Mode
Signal Name in
RDY/BSY
PAGEL
1. Unused Pins should be left floating.
DATA
BS1
XA0
XA1
BS2
WR
BS1
0
OE
Flash /
EEPROM
Address
Low Byte
RDY/BSY
PAGEL
Pin Name
+12 V
BS1
XA0
XA1
BS2
WR
PB7-0
OE
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PA0
(1)
Flash Data
Loading /
Reading
Low Byte
PD1
PD2
PD3
PD4
PD5
PD6
PD7
RESET
XTAL1
GND
I/O
I/O
PA0
O
I
I
I
I
I
I
I
Function
0: Device is busy programming, 1: Device is
ready for new command.
Output Enable (Active low).
Write Pulse (Active low).
Byte Select 1.
XTAL Action Bit 0
XTAL Action Bit 1
Program Memory and EEPROM data Page Load.
Byte Select 2.
Bi-directional Data bus (Output when OE is low).
PB7 - PB0
AVCC
VCC
Fuse
Programming
Low Byte
+5V
+5V
DATA
Reading Fuse
and Lock Bits
Fuse Low Byte
2549K–AVR–01/07