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8048B–AVR–03/09
Figure 19-1. Parallel Programming
Table 19-10. Pin Name Mapping
Signal Name in
Programming Mode
Pin
Name I/O Function
WR
PA0 I Write Pulse (Active low).
XA0 PA1 I CLKI Action Bit 0
XA1/BS2 PA2 I
CLKI Action Bit 1. Byte Select 2 (“0” selects low byte, “1”
selects 2’nd high byte).
PAGEL/ BS1 PA 3 I
Byte Select 1 (“0” selects low byte, “1” selects high byte).
Program Memory and EEPROM Data Page Load.
OE
PA5 I Output Enable (Active low).
RDY/BSY PA6 O
0: Device is busy programming, 1: Device is ready for new
command.
DATA I/O PB7-PB0 I/O Bi-directional Data bus (Output when OE is low).
Table 19-11. Pin Values Used to Enter Programming Mode
Pin Symbol Value
PAGEL/BS1 Prog_enable[3] 0
XA1/BS2 Prog_enable[2] 0
XA0 Prog_enable[1] 0
WR Prog_enable[0] 0
VCC
GND
CLKI/PA6
PA 5
PA 4
PA 0
PA 3
PA 1
PA 2
PB7 - PB0 DAT
RESET/PA7
+12 V
AGEL/BS1
XA0
XA1/BS2
OE
RDY/BSY
WR
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