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型號(hào)：	MQ83C154TXXX-25/883
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 25 MHz, MICROCONTROLLER, CQFP44
文件頁(yè)數(shù)：	58/839頁(yè)
文件大?。?/td>	61013K
代理商：	MQ83C154TXXX-25/883

ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P [DATASHEET]

8285E–AVR–02/2013

The relationship between SCK and the Oscillator Clock frequency f

osc is shown in the following table:

SPSR – SPI Status Register

Bit 7 – SPIF: SPI Interrupt Flag

When a serial transfer is complete, the SPIF Flag is set. An interrupt is generated if SPIE in SPCR is set and global

interrupts are enabled. If SS is an input and is driven low when the SPI is in Master mode, this will also set the SPIF

Flag. SPIF is cleared by hardware when executing the corresponding interrupt handling vector. Alternatively, the

SPIF bit is cleared by first reading the SPI Status Register with SPIF set, then accessing the SPI Data Register

Bit 6 – WCOL: Write COLlision Flag

The WCOL bit is set if the SPI Data Register (SPDR) is written during a data transfer. The WCOL bit (and the SPIF

bit) are cleared by first reading the SPI Status Register with WCOL set, and then accessing the SPI Data Register.

Bit 5:1 – Reserved

These bits are reserved and will always read as zero.

Bit 0 – SPI2X: Double SPI Speed Bit

When this bit is written logic one the SPI speed (SCK Frequency) will be doubled when the SPI is in Master mode

(see Table 19-5). This means that the minimum SCK period will be two CPU clock periods. When the SPI is config-

ured as Slave, the SPI is only guaranteed to work at f

osc/4 or lower.

The SPI interface on the

ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P is also used for program memory

and EEPROM downloading or uploading. See page 271 for serial programming and verification.

SPDR – SPI Data Register

The SPI Data Register is a read/write register used for data transfer between the Register File and the SPI Shift

buffer to be read.

Table 19-5.

Relationship between SCK and the oscillator frequency.

SCK Frequency

Initial Value

Initial Value

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