ATMEGA64A-MN Atmel, ATMEGA64A-MN Datasheet - Page 266
ATMEGA64A-MN
Manufacturer Part Number
ATMEGA64A-MN
Description
IC MCU AVR 64K FLASH 8QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA64A-AU.pdf
(392 pages)
Specifications of ATMEGA64A-MN
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
53
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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25.5.4
8160C–AVR–07/09
Scanning the Clock Pins
The AVR devices have many clock options selectable by fuses. These are: Internal RC Oscilla-
tor, External RC, External Clock, (High Frequency) Crystal Oscillator, Low-frequency Crystal
Oscillator, and Ceramic Resonator.
Figure 25-7
The Enable signal is supported with a general boundary-scan cell, while the Oscillator/clock out-
put is attached to an observe-only cell. In addition to the main clock, the timer Oscillator is
scanned in the same way. The output from the internal RC Oscillator is not scanned, as this
Oscillator does not have external connections.
Figure 25-7. Boundary-scan Cells for Oscillators and Clock Options
Table 25-3
XTAL1/XTAL2 connections as well as 32 kHz Timer Oscillator.
Table 25-3.
Note:
Enable Signal
EXTCLKEN
OSCON
RCOSCEN
OSC32EN
TOSKON
Previous
1. Do not enable more than one clock source as main clock at a time.
2. Scanning an Oscillator output gives unpredictable results as there is a frequency drift between
3. The clock configuration is programmed by fuses. As a fuse does not change run-time, the
From
Cell
the internal Oscillator and the JTAG TCK clock. If possible, scanning an external clock is
preferred.
clock configuration is considered fixed for a given application. The user is advised to scan the
ShiftDR
shows how each Oscillator with external connection is supported in the scan chain.
summaries the scan registers for the external clock pin XTAL1, oscillators with
0
1
Scan Signals for the Oscillators
ClockDR
Scanned Clock Line
EXTCLK (XTAL1)
OSCCK
RCCK
OSC32CK
TOSCK
D
UpdateDR
Q
Next
Cell
To
D
G
Q
EXTEST
0
1
Clock Option
External Clock
External Crystal
External Ceramic Resonator
External RC
Low Freq. External Crystal
32 kHz Timer Oscillator
XTAL1/TOSC1
ENABLE
(1)(2)(3)
Oscillator
XTAL2/TOSC2
OUTPUT
Previous
From
Cell
ShiftDR
0
1
ATmega64A
ClockDR
Scanned Clock Line
when Not Used
D
FF1
Q
0
0
0
1
0
Next
Cell
To
266
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