AT90PWM2 datasheet(306/365 Pages) ATMEL

306 / 365 page

306

AT90PWM2/3

4317B–AVR–02/05

Data Polling EEPROM

When a new byte has been written and is being programmed into EEPROM, reading the

address location being programmed will give the value 0xFF. At the time the device is

ready for a new byte, the programmed value will read correctly. This is used to deter-

mine when the next byte can be written. This will not work for the value 0xFF, but the

user should have the following in mind: As a chip-erased device contains 0xFF in all

locations, programming of addresses that are meant to contain 0xFF, can be skipped.

This does not apply if the EEPROM is re-programmed without chip erasing the device.

In this case, data polling cannot be used for the value 0xFF, and the user will have to

wait at least t

WD_EEPROM before programming the next byte. See Table 131 for

WD_EEPROM value.

Figure 146. Serial Programming Waveforms

Table 131. Minimum Wait Delay Before Writing the Next Flash or EEPROM Location

Symbol

Minimum Wait Delay

WD_FLASH

4.5 ms

WD_EEPROM

3.6 ms

WD_ERASE

9.0 ms

MSB

LSB

SERIAL CLOCK INPUT

(SCK)

SERIAL DATA INPUT

(MOSI)

(MISO)

SAMPLE

SERIAL DATA OUTPUT

Table 132. Serial Programming Instruction Set

Instruction

Instruction Format

Operation

Byte 1

Byte 2

Byte 3

Byte4

Programming Enable

1010 1100

0101 0011

xxxx xxxx

Enable Serial Programming after

RESET goes low.

Chip Erase

1010 1100

100x xxxx

xxxx xxxx

Chip Erase EEPROM and Flash.

Read Program Memory

0010 H000

000a aaaa

bbbb bbbb

oooo oooo

Read H (high or low) data o from

Program memory at word address a:b.

Load Program Memory Page

0100 H000

000x xxxx

xxbb bbbb

iiii iiii

Write H (high or low) data i to Program

Memory page at word address b. Data

low byte must be loaded before Data

high byte is applied within the same

address.

Write Program Memory Page

0100 1100

000a aaaa

xx xxxx

xxxx xxxx

Write Program Memory Page at

address a:b.

Read EEPROM Memory

1010 0000

000x xxaa

bbbb bbbb

oooo oooo

Read data o from EEPROM memory at

address a:b.

AT90PWM2 Datasheet(PDF) 306 Page - ATMEL Corporation

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