AT90PWM2 datasheet(284/361 Pages) ATMEL

284 / 361 page

284

4317J–AVR–08/10

AT90PWM2/3/2B/3B

25.7

Serial Programming Pin Mapping

Table 25-9.

XA1 and XA0 Coding

XA1

XA0

Action when XTAL1 is Pulsed

Load Flash or EEPROM Address (High or low address byte determined by

BS1).

Load Data (High or Low data byte for Flash determined by BS1).

Load Command

No Action, Idle

Table 25-10. Command Byte Bit Coding

Command Byte

Command Executed

1000 0000

Chip Erase

0100 0000

Write Fuse bits

0010 0000

Write Lock bits

0001 0000

Write Flash

0001 0001

Write EEPROM

0000 1000

Read Signature Bytes and Calibration byte

0000 0100

Read Fuse and Lock bits

0000 0010

Read Flash

0000 0011

Read EEPROM

Table 25-11. No. of Words in a Page and No. of Pages in the Flash

Device

Flash Size

Page Size

PCWORD

No. of

Pages

PCPAGE

PCMSB

AT90PWM2/2B/3/

4K words

(8K bytes)

32 words

PC[4:0]

128

PC[11:5]

Table 25-12. No. of Words in a Page and No. of Pages in the EEPROM

Device

EEPROM

Size

Page

Size

PCWORD

No. of

Pages

PCPAGE

EEAMSB

AT90PWM2/2B/3/

512 bytes

4 bytes

EEA[1:0]

128

EEA[8:2]

Table 25-13. Pin Mapping Serial Programming

Symbol

Pins

I/O

Description

MOSI_A

PD3

Serial Data in

MISO_A

PD2

Serial Data out

SCK_A

PD4

Serial Clock

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