atmega3250v-8auatmega325v-8ai ATMEL Corporation, atmega3250v-8auatmega325v-8ai Datasheet - Page 268
atmega3250v-8auatmega325v-8ai
Manufacturer Part Number
atmega3250v-8auatmega325v-8ai
Description
Atmega3250 8-bit Microcontroller With In-system Programmable Flash
Manufacturer
ATMEL Corporation
Datasheet
1.ATMEGA3250V-8AUATMEGA325V-8AI.pdf
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ATmega325/3250/645/6450
Figure 27-1. Parallel Programming
Table 27-6.
Table 27-7.
Programming Mode
Signal Name in
RDY/BSY
PAGEL
DATA
BS1
XA0
XA1
BS2
WR
OE
PAGEL
XA1
XA0
BS1
Pin
Pin Name Mapping
Pin Values Used to Enter Programming Mode
Pin Name
RDY/BSY
PB7-0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PA0
PAGEL
+12 V
BS2
BS1
XA0
XA1
WR
OE
I/O
I/O
O
I
I
I
I
I
I
I
Prog_enable[3]
Prog_enable[2]
Prog_enable[1]
Prog_enable[0]
PD1
PD2
PD3
PD4
PD5
PD6
PD7
RESET
XTAL1
GND
Symbol
PA0
Function
0: Device is busy programming, 1: Device is ready
for new command.
Output Enable (Active low).
Write Pulse (Active low).
Byte Select 1 (“0” selects low byte, “1” selects high
byte).
XTAL Action Bit 0
XTAL Action Bit 1
Program Memory and EEPROM data Page Load.
Byte Select 2 (“0” selects low byte, “1” selects 2’nd
high byte).
Bi-directional Data bus (Output when OE is low).
PB7 - PB0
AVCC
VCC
+5V
+5V
DATA
Value
0
0
0
0
2570L–AVR–08/07
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