AT90PWM2 datasheet(25/365 Pages) ATMEL

部品番号	AT90PWM2

部品情報	8-bit Microcontroller with 8K Bytes In-System Programmable Flash

PDF	365 Pages

Scroll/Zoom	100%

メーカー	ATMEL [ATMEL Corporation]

ホームページ	http://www.atmel.com

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25 / 365 page

AT90PWM2/3

4317B–AVR–02/05

EEWE has been set, the CPU is halted for two cycles before the next instruction is

executed.

• Bit 0 – EERE: EEPROM Read Enable

The EEPROM Read Enable Signal EERE is the read strobe to the EEPROM. When the

correct address is set up in the EEAR Register, the EERE bit must be written to a logic

one to trigger the EEPROM read. The EEPROM read access takes one instruction, and

the requested data is available immediately. When the EEPROM is read, the CPU is

halted for four cycles before the next instruction is executed.

The user should poll the EEWE bit before starting the read operation. If a write operation

is in progress, it is neither possible to read the EEPROM, nor to change the EEAR

The calibrated Oscillator is used to time the EEPROM accesses. Table 2 lists the typical

programming time for EEPROM access from the CPU.

Note:

1. Uses 1 MHz clock, independent of CKSEL Fuse settings.

Table 2. EEPROM Programming Time.

Symbol

Number of Calibrated RC Oscillator Cycles

Typ Programming Time

EEPROM write

(from CPU)

67 584

8.5 ms

AT90PWM2 データシート(PDF) 25 Page - ATMEL Corporation