ATMEGA164A_11 ATMEL [ATMEL Corporation], ATMEGA164A_11 Datasheet - Page 8

• Manufacturer Part Number: ATMEGA164A_11
• Description: 8-bit Atmel Microcontroller with 16/32/64/128K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

2.3.6
2.3.7
2.3.8
2.3.9
2.3.10
2.3.11
8272CS–AVR–06/11
Port D (PD7:PD0)
RESET
XTAL1
XTAL2
AVCC
AREF
capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port C pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
Port C also serves the functions of the JTAG interface, along with special features of the
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port D output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port D pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port D pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
P o r t D a l s o s e r v e s t h e f u n c t i o n s o f v a r i o u s s p e c i a l f e a t u r e s o f t h e
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P as listed on
Reset input. A low level on this pin for longer than the minimum pulse length will generate a
reset, even if the clock is not running. The minimum pulse length is given in
Characteristics” on page
Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.
Output from the inverting Oscillator amplifier.
AVCC is the supply voltage pin for Port A and the Analog-to-digital Converter. It should be exter-
nally connected to V
to V
This is the analog reference pin for the Analog-to-digital Converter.
CC
through a low-pass filter.
ATmega164A/PA/324A/PA/644A/PA/1284/P
CC
, even if the ADC is not used. If the ADC is used, it should be connected
337. Shorter pulses are not guaranteed to generate a reset.
page
page
”System and Reset
85.
88.
8