Rainbow Electronics ATmega103L - Manual (Page 94)

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