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ATMEGA16M1_09 参数 Datasheet PDF下载

ATMEGA16M1_09图片预览
型号: ATMEGA16M1_09
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器与16/32 / 64K字节的系统内可编程闪存 [8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash]
分类和应用: 闪存微控制器
文件页数/大小: 22 页 / 621 K
品牌: ATMEL [ ATMEL CORPORATION ]
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ATmega16M1/32M1/64M1
2.2.5
Port D (PD7..PD0)
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.
Port D also serves the functions of various special features of the ATmega16M1/32M1/64M1 as
listed on
2.2.6
Port E (PE2..0) RESET/ XTAL1/
XTAL2
Port E is an 3-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
Port E output buffers have symmetrical drive characteristics with both high sink and source
capability. As inputs, Port E pins that are externally pulled low will source current if the pull-up
resistors are activated. The Port E pins are tri-stated when a reset condition becomes active,
even if the clock is not running.
If the RSTDISBL Fuse is programmed, PE0 is used as an I/O pin. Note that the electrical char-
acteristics of PE0 differ from those of the other pins of Port E.
If the RSTDISBL Fuse is unprogrammed, PE0 is used as a 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
Shorter
pulses are not guaranteed to generate a Reset.
Depending on the clock selection fuse settings, PE1 can be used as input to the inverting Oscil-
lator amplifier and input to the internal clock operating circuit.
Depending on the clock selection fuse settings, PE2 can be used as output from the inverting
Oscillator amplifier.
The various special features of Port E are elaborated in
and
2.2.7
AVCC
AVCC is the supply voltage pin for the A/D Converter, D/A Converter, Current source. It should
be externally connected to V
CC
, even if the ADC, DAC are not used. If the ADC is used, it should
be connected to V
CC
through a low-pass filter.
2.2.8
AREF
This is the analog reference pin for the A/D Converter.
8
8209BS–AVR–10/09