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ATMEGA640 Datasheet(PDF) 329 Page - Microchip Technology

Part # ATMEGA640
Description  8-bit Microcontroller with 16/32/64KB In-System Programmable Flash
PDF  436 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

ATMEGA640 Datasheet(HTML) 329 Page - Microchip Technology

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]
DS40002211A
Figure 30-1. Parallel Programming(1)
Note:
1. Unused Pins should be left floating.
Table 30-9.
Pin Name Mapping
Signal Name in
Programming Mode
Pin Name
I/O
Function
RDY/BSY
PD1
O
0: Device is busy programming, 1: Device is ready for new command
OE
PD2
I
Output Enable (Active low)
WR
PD3
I
Write Pulse (Active low)
BS1
PD4
I
Byte Select 1
XA0
PD5
I
XTAL Action Bit 0
XA1
PD6
I
XTAL Action Bit 1
PAGEL
PD7
I
Program Memory and EEPROM data Page Load
BS2
PA0
I
Byte Select 2
DATA
PB7-0
I/O
Bi-directional Data bus (Output when OE is low)
Table 30-10. BS2 and BS1 Encoding
BS2
BS1
Flash / EEPROM
Address
Flash Data Loading /
Reading
Fuse Programming
Reading Fuse and Lock
Bits
0
0
Low Byte
Low Byte
Low Byte
Fuse Low Byte
0
1
High Byte
High Byte
High Byte
Lockbits
10
Extended High
Byte
Reserved
Extended Byte
Extended Fuse Byte
1
1
Reserved
Reserved
Reserved
Fuse High Byte
VCC
+5V
GND
XTAL1
PD1
PD2
PD3
PD4
PD5
PD6
PB7 - PB0
DATA
RESET
PD7
+12V
BS1
XA0
XA1
OE
RDY/BSY
PAGEL
PA0
WR
BS2
AVCC
+5V



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