E figure 72, D table 38, Table 38 – Rainbow Electronics ATmega103L User Manual
Page 94: Table 39
ATmega603/103
94
Figure 72. Parallel Programming
.
Table 38. 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
BS2
PD7
I
Byte Select 2 (Always low)
PAGEL
PA0
I
Program Memory Page Load
DATA
PB7-0
I/O
Bidirectional Data bus (Output when OE is low)
Table 39. 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
ATmega603(L),
ATmega103(L)
VCC
+5V
PA0
GND
XTAL1
PD1
PD2
PD3
PD4
PD5
PD6
PAGEL
RDY/BSY
OE
BS1
XA0
XA1
WR
PB7 - PB0
DATA
RESET
+12V
PD7