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ATmega128
Parallel
Programming
Parameters, Pin
Mapping, and
Commands
Signal Names
This section describes how to parallel program and verify Flash Program memory, EEPROM
Data memory, Memory Lock bits, and Fuse bits in the Atmel ? AVR ? ATmega128. Pulses are
assumed to be at least 250ns unless otherwise noted.
In this section, some pins of the ATmega128 are referenced by signal names describing their
functionality during parallel programming, see Figure 135 and Table 120 . Pins not described in
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 Table 122 .
W hen pulsing W R or OE, the command loaded determines the action executed. The different
Commands are shown in Table 123 .
Figure 135. Parallel Programming
+5V
RDY/BSY
OE
WR
BS1
PD1
PD2
PD3
PD4
VCC
AVCC
+5V
XA0
XA1
PAGEL
+12 V
BS2
PD5
PD6
PD7
RESET
PA0
PB7 - PB0
DATA
XTAL1
GND
Table 120. Pin Name Mapping
Signal Name in
Programming Mode
RDY/BSY
OE
W R
BS1
XA0
XA1
Pin Name
PD1
PD2
PD3
PD4
PD5
PD6
I/O
O
I
I
I
I
I
Function
0: Device is busy programming, 1: Device is ready for new
command
Output Enable (Active low)
W rite Pulse (Active low)
Byte Select 1 (“0” selects low byte, “1” selects high byte)
XTAL Action Bit 0
XTAL Action Bit 1
290
2467X–AVR–06/11
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