E figure 81 and table 55, Table 56, Atmega163(l) – Rainbow Electronics ATmega163L User Manual
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ATmega163(L)
125
Figure 81. Parallel Programming
ATmega163
VCC
+5V
GND
XTAL1
PD1
PD2
PD3
PD4
PD5
PD6
PB7 - PB0
DATA
RESET
PD7
+12 V
BS1
XA0
XA1
OE
RDY/BSY
PAGEL
PA0
WR
BS2
Table 55. 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 Page Load
BS2
PA0
I
Byte Select 2 (‘0’ selects low byte, ‘1’ selects 2’nd high byte)
DATA
PB7-0
I/O
Bidirectional Databus (Output when OE is low)
Table 56. XA1 and XA0 Coding
XA1
XA0
Action when XTAL1 is Pulsed
0
0
Load Flash or EEPROM Address (High or low address byte determined by BS1)
0
1
Load Data (High or Low data byte for Flash determined by BS1)
1
0
Load Command
1
1
No Action, Idle