Datasheet

234

ATmega162/V

2513G–AVR–03/05

Table 102. 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

PD2 I Output Enable (Active low)

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

PAGEL PD7 I Program Memory and EEPROM data Page Load

BS2 PA0 I

Byte Select 2 (“0” selects low byte, “1” selects 2’nd

high byte)

DATA PB7 - 0 I/O Bi-directional Data bus (Output when OE

is low)

Table 103. Pin Values used to Enter Programming Mode

Pin Symbol Value

PAGEL Prog_enable[3] 0

XA1 Prog_enable[2] 0

XA0 Prog_enable[1] 0

BS1 Prog_enable[0] 0

Table 104. 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