ATMEGA128-16AU SL383 Atmel, ATMEGA128-16AU SL383 Datasheet - Page 290

• Manufacturer Part Number: ATMEGA128-16AU SL383
• Manufacturer: Atmel

Parallel
Programming
Parameters, Pin
Mapping, and
Commands
Signal Names
290
ATmega128
This section describes how to parallel program and verify Flash Program memory, EEPROM
Data memory, Memory Lock bits, and Fuse bits in the ATmega128. Pulses are assumed to be at
least 250 ns unless otherwise noted.
In this section, some pins of the ATmega128 are referenced by signal names describing their
functionality during parallel programming, see
the following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.
The bit coding is shown in
When pulsing WR or OE, the command loaded determines the action executed. The different
Commands are shown in
Figure 135. Parallel Programming
Table 120. Pin Name Mapping
Signal Name in
Programming Mode
RDY/BSY
OE
WR
BS1
XA0
RDY/BSY
PAGEL
+12 V
Pin Name
BS2
BS1
XA0
XA1
WR
OE
Table
PD1
PD2
PD3
PD4
PD5
Table
123.
122.
I/O
O
I
I
I
I
PD1
PD2
PD3
PD4
PD5
PD6
PD7
RESET
XTAL1
GND
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
Figure 135
PB7 - PB0
AVCC
VCC
and
Table
+5V
+5V
120. Pins not described in
DATA
2467S–AVR–07/09