ATMEGA329V_0611 Datasheet, PDF (285/375 Pages) ATMEL Corporation – 8-bit Microcontroller with In-System Programmable Flash

2552H–AVR–11/06
ATmega329/3290/649/6490
Figure 120. Parallel Programming
RDY/BSY
OE
WR
BS1
XA0
XA1
PAGEL
+12 V
BS2
PD1
PD2
PD3
PD4
PD5
PD6
PD7
RESET
PA0
XTAL1
GND
+5V
VCC
+5V
AVCC
PB7 - PB0
DATA
Table 128. 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 (“0” selects low byte, “1” selects high
byte).
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 (“0” selects low byte, “1” selects 2’nd
high byte).
DATA
PB7-0 I/O Bi-directional Data bus (Output when OE is low).
Table 129. Pin Values Used to Enter Programming Mode
Pin
Symbol
PAGEL
Prog_enable[3]
XA1
Prog_enable[2]
XA0
Prog_enable[1]
BS1
Prog_enable[0]
Value
0
0
0
0
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