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您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄45320 > MQ83C154XXX-16P883R (ATMEL CORP) 8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44 PDF資料下載

型號(hào)：	MQ83C154XXX-16P883R
廠商：	ATMEL CORP
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
封裝：	CERAMIC, QFP-44
文件頁(yè)數(shù)：	201/839頁(yè)
文件大?。?/td>	61013K
代理商：	MQ83C154XXX-16P883R

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

8285E–AVR–02/2013

Asynchronous Timer Clock – clk

The Asynchronous Timer clock allows the Asynchronous Timer/Counter to be clocked directly from an external

clock or an external 32kHz clock XTAL. The dedicated clock domain allows using this Timer/Counter as a real-time

counter even when the device is in sleep mode.

ADC Clock – clk

The ADC is provided with a dedicated clock domain. This allows halting the CPU and I/O clocks in order to reduce

noise generated by digital circuitry. This gives more accurate ADC conversion results.

Clock Sources

The device has the following clock source options, selectable by Flash Fuse bits as shown below. The clock from

the selected source is input to the AVR clock generator, and routed to the appropriate modules.

1. For all fuses “1” means unprogrammed while “0” means programmed.

The various choices for each clocking option is given in the following sections. When the CPU wakes up from

Power-down or Power-save, the selected clock source is used to time the start-up, ensuring stable Oscillator oper-

ation before instruction execution starts. When the CPU starts from reset, there is an additional delay allowing the

power to reach a stable level before commencing normal operation. The Watchdog Oscillator is used for timing this

real-time part of the start-up time. The number of WDT Oscillator cycles used for each time-out is shown in Table 9-

2. The frequency of the Watchdog Oscillator is voltage dependent as shown in ”Typical characteristics – TA = -

Table 9-1.

Device clocking options select

Device clocking option

CKSEL3:0

External XTAL/Ceramic Resonator

External Low-frequency XTAL

Calibrated Internal RC Oscillator

External Clock

0011, 0001, 0101, 0100

Table 9-2.

Number of Watchdog Oscillator cycles.

Typical time-out (V

CC = 5.0V)

Typical time-out (V

CC = 3.0V)

Number of cycles

64K (65,536)

相關(guān)PDF資料	PDF描述
MD83C154CXXX-20/883	8-BIT, MROM, 20 MHz, MICROCONTROLLER, CDIP40
MQ83C154XXX-20P883	8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQFP44
MR80C154-30P883R	8-BIT, 30 MHz, MICROCONTROLLER, CQCC44
MR83C154TXXX-30/883D	8-BIT, MROM, 30 MHz, MICROCONTROLLER, CQCC44
MD80C154-16P883	8-BIT, 16 MHz, MICROCONTROLLER, CDIP40

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