Rainbow-electronics Atmega169L Manuel d'utilisateur télécharger pdf (Page 269)

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ATmega169V/L

2514A–AVR–08/02

Table 121. 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 122. 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 123. 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

1 2 ... 264 265 266 267 268 269 270 271 272 273 274 ... 316 317

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