Rainbow Electronics ATtiny28L - Manual (Page 45)

45
ATtiny28L/V
1062E–10/01
Parallel Programming This section describes how to parallel program and verify Flash program memory, Lock
bits and Fuse bits in the ATtiny28.
Signal Names In this section, some pins of the ATtiny28 are referenced by signal names describing
their function during parallel programming. See Figure 36 and Table 22. Pins not
described in Table 22 are referenced by pin name.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a posi-
tive pulse. The coding is shown in Table 23.
When pulsing WR or OE, the command loaded determines the action executed. The
command is a byte where the different bits are assigned functions, as shown in Table
24.
Figure 36. Parallel Programming
Table 21. Supply Voltage during Programming
Part Serial Programming Parallel Programming
ATtiny28 Not applicable 4.5 - 5.5V
VCC
+5V
RESET
GND
XTAL1
PD1
PD2
PD3
PD4
PD5
PD6
+12V
RDY/BSY
OE
BS
XA0
XA1
WR
PB7 - PB0 DATA
ATtiny28