ATMEGA324P-A15MZ Atmel, ATMEGA324P-A15MZ Datasheet - Page 232

• Manufacturer Part Number: ATMEGA324P-A15MZ
• Description: MCU AVR 32KB FLASH 15MHZ 44-VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA324P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 1K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 2K x 8
• Program Memory Size: 32KB (32K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Scanning the Analog
Comparator
232
ATmega32(L)
Figure 120. Boundary-scan Cells for Oscillators and Clock Options
Table 89
XTAL1/XTAL2 connections as well as 32 kHz Timer Oscillator.
Table 89. Scan Signals for the Oscillators
Notes:
The relevant Comparator signals regarding Boundary-scan are shown in
Boundary-scan cell from
described in
The Comparator need not be used for pure connectivity testing, since all analog inputs are
shared with a digital port pin as well.
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 is not changed run-time, the clock
From
Cell
summaries the scan registers for the external clock pin XTAL1, Oscillators with
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
Table
0
1
ClockDR
Scanned Clock Line
EXTCLK (XTAL1)
OSCCK
RCCK
OSC32CK
TOSCK
90.
D
UpdateDR
Q
Next
Cell
To
Figure 122
D
G
Q
EXTEST
0
1
is attached to each of these signals. The signals are
Clock Option
External Clock
External Crystal
External Ceramic
Resonator
External RC
Low Freq. External Crystal
32 kHz Timer Oscillator
XTAL1/TOSC1
(1)(2)(3)
ENABLE
Oscillator
XTAL2/TOSC2
OUTPUT
Previous
Scanned Clock Line
when not Used
From
Cell
ShiftDR
0
1
ClockDR
0
0
1
0
0
D
Figure
FF1
Q
Next
2503N–AVR–06/08
Cell
To
121. The