Rainbow Electronics ATtiny2313 - Manual (Page 163)

163
ATtiny2313
2543A–AVR–08/03
Parallel Programming
Parameters, Pin
Mapping, and
Commands This section describes how to parallel program and verify Flash Program memory,
EEPROM Data memory, Memory Lock bits, and Fuse bits in the ATtiny2313. Pulses are
assumed to be at least 250 ns unless otherwise noted.
Signal Names In this section, some pins of the ATtiny2313 are referenced by signal names describing
their functionality during parallel programming, see Figure 68 and Table 70. Pins not
described in the following table are referenced by pin names.
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a posi-
tive pulse. The bit coding is shown in Table 72.
When pulsing WR or OE, the command loaded determines the action executed. The dif-
ferent Commands are shown in Table 73.
Figure 68. Parallel Programming
Table 70. 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/PAGEL PD4 I
Byte Select 1 (“0” selects low byte, “1” selects
high byte).
Program Memory and EEPROM Data Page Load.
XA0 PD5 I XTAL Action Bit 0
XA1/BS2 PD6 I
XTAL Action Bit 1.
Byte Select 2 (“0” selects low byte, “1” selects
2’nd high byte).
DATA I/O PB7-0 I/O Bi-directional Data bus (Output when OE is low).
VCC
+5V
GND
XTAL1
PD1
PD2
PD3
PD4
PD5
PD6
PB7 - PB0 DATA I/O
RESET +12 V
BS1/PAGEL
XA0
XA1/BS2
OE
RDY/BSY
WR