Rainbow Electronics ATtiny861_V - Manual (Page 172)

172
2588B–AVR–11/06
ATtiny261/461/861
Figure 22-1. Parallel Programming
Table 22-9. Pin Name Mapping
Signal Name in
Programming Mode
Pin
Name I/O Function
WR PB0 I Write Pulse (Active low).
XA0 PB1 I XTAL Action Bit 0
XA1/BS2 PB2 I
XTAL Action Bit 1. Byte Select 2 (“0” selects low byte, “1”
selects 2’nd high byte).
PAGEL/BS1 PB3 I
Byte Select 1 (“0” selects low byte, “1” selects high byte).
Program Memory and EEPROM Data Page Load.
OE PB5 I Output Enable (Active low).
RDY/BSY PB6 O
0: Device is busy programming, 1: Device is ready for new
command.
DATA I/O PA7-PA0 I/O Bi-directional Data bus (Output when OE is low).
Table 22-10. 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
+5V
GND
XTAL1/PB4
PB6
PB5
PB0
PB3
PB1
PB2
PA7 - PA0 DATA
RESET +12 V
PAGEL/BS1
XA0
XA1/BS2
OE
RDY/BSY
WR
AVCC
+5V