ATMEGA32A-ANR Atmel, ATMEGA32A-ANR Datasheet - Page 241
![IC MCU AVR 32K FLASH 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA32A-ANR
Manufacturer Part Number
ATMEGA32A-ANR
Description
IC MCU AVR 32K FLASH 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA32A-MU.pdf
(353 pages)
Specifications of ATMEGA32A-ANR
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
32
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K 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
44-TQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Part Number
Manufacturer
Quantity
Price
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24.5.5
8155C–AVR–02/11
Scanning the Analog Comparator
Figure 24-7. Boundary-scan Cells for Oscillators and Clock Options
Table 24-3
XTAL1/XTAL2 connections as well as 32kHz Timer Oscillator.
Table 24-3.
Notes:
The relevant Comparator signals regarding Boundary-scan are shown in
Boundary-scan cell from
described in
Enable Signal
EXTCLKEN
OSCON
RCOSCEN
OSC32EN
TOSKON
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 is not changed run-time, the clock
Previous
From
Cell
the Internal Oscillator and the JTAG TCK clock. If possible, scanning an external clock is
preferred.
configuration is considered fixed for a given application. The user is advised to scan the same
clock option as to be used in the final system. The enable signals are supported in the scan
chain because the system logic can disable clock options in sleep modes, thereby disconnect-
ing the Oscillator pins from the scan path if not provided. The INTCAP fuses are not supported
in the scan-chain, so the boundary scan chain can not make a XTAL Oscillator requiring inter-
nal capacitors to run unless the fuse is correctly programmed.
ShiftDR
summaries the scan registers for the external clock pin XTAL1, Oscillators with
Table
0
1
ClockDR
Scan Signals for the Oscillators
RCCK
TOSCK
Scanned Clock Line
EXTCLK (XTAL1)
OSCCK
OSC32CK
24-4.
D
UpdateDR
Q
Next
Cell
To
Figure 24-9
D
G
Q
EXTEST
0
1
Clock Option
External Clock
External Crystal
External Ceramic
Resonator
External RC
Low Freq. External Crystal
32kHz Timer Oscillator
is attached to each of these signals. The signals are
XTAL1/TOSC1
ENABLE
(1)(2)(3)
Oscillator
XTAL2/TOSC2
OUTPUT
Previous
Scanned Clock Line
when not Used
From
Cell
ShiftDR
0
1
ATmega32A
ClockDR
0
0
1
0
0
Figure
D
FF1
Q
Next
Cell
To
24-8. The
241
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