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型號(hào)：	MQ83C154TXXX-L16P883
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
文件頁(yè)數(shù)：	368/839頁(yè)
文件大?。?/td>	61013K
代理商：	MQ83C154TXXX-L16P883

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

8285E–AVR–02/2013

11. System control and reset

Resetting the AVR

During reset, all I/O Registers are set to their initial values, and the program starts execution from the Reset Vec-

tor. The instruction placed at the Reset Vector must be a JMP – Absolute Jump – instruction to the reset handling

routine. If the program never enables an interrupt source, the Interrupt Vectors are not used, and regular program

code can be placed at these locations. This is also the case if the Reset Vector is in the Application section while

the Interrupt Vectors are in the Boot section or vice versa. The circuit diagram in Figure 11-1 on page 44 shows the

reset logic. Table 28-13 on page 297 defines the electrical parameters of the reset circuitry.

The I/O ports of the AVR are immediately reset to their initial state when a reset source goes active. This does not

require any clock source to be running.

After all reset sources have gone inactive, a delay counter is invoked, stretching the internal reset. This allows the

power to reach a stable level before normal operation starts. The time-out period of the delay counter is defined by

the user through the SUT and CKSEL Fuses. The different selections for the delay period are presented in ”Clock

Reset Sources

The Atmel ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P has five sources of reset:

Power-on Reset

The MCU is reset when the supply voltage is below the Power-on Reset threshold (V

External Reset

The MCU is reset when a low level is present on the RESET pin for longer than the minimum pulse length

Watchdog Reset

The MCU is reset when the Watchdog Timer period expires and the Watchdog is enabled

Brown-out Reset

The MCU is reset when the supply voltage V

CC is below the Brown-out Reset threshold (VBOT) and the Brown-out

Detector is enabled

JTAG AVR Reset

The MCU is reset as long as there is a logic one in the Reset Register, one of the scan chains of the JTAG

相關(guān)PDF資料	PDF描述
MQ83C154XXX-L16P883D	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
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MR83C154TXXX-30/883D	8-BIT, MROM, 30 MHz, MICROCONTROLLER, CQCC44
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