MCU AVR 16K FLASH 16MHZ 40-PDIP

ATMEGA16A-PU

Manufacturer Part NumberATMEGA16A-PU
DescriptionMCU AVR 16K FLASH 16MHZ 40-PDIP
ManufacturerAtmel
SeriesAVR® ATmega
ATMEGA16A-PU datasheets
 


Specifications of ATMEGA16A-PU

Core ProcessorAVRCore Size8-Bit
Speed16MHzConnectivityI²C, SPI, UART/USART
PeripheralsBrown-out Detect/Reset, POR, PWM, WDTNumber Of I /o32
Program Memory Size16KB (8K x 16)Program Memory TypeFLASH
Eeprom Size512 x 8Ram Size1K x 8
Voltage - Supply (vcc/vdd)2.7 V ~ 5.5 VData ConvertersA/D 8x10b
Oscillator TypeInternalOperating Temperature-40°C ~ 85°C
Package / Case40-DIP (0.600", 15.24mm)Processor SeriesATMEGA16x
CoreAVR8Data Bus Width8 bit
Data Ram Size1 KBInterface Type2-Wire/SPI/USART
Maximum Clock Frequency16 MHzNumber Of Programmable I/os32
Number Of Timers3Maximum Operating Temperature+ 85 C
Mounting StyleThrough Hole3rd Party Development ToolsEWAVR, EWAVR-BL
Development Tools By SupplierATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKITMinimum Operating Temperature- 40 C
On-chip Adc8-ch x 10-bitPackage40PDIP
Device CoreAVRFamily NameATmega
Maximum Speed16 MHzOperating Supply Voltage3.3|5 V
Controller Family/seriesAVR MEGANo. Of I/o's32
Eeprom Memory Size512ByteRam Memory Size1KB
Cpu Speed16MHzRohs CompliantYes
For Use WithATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KITLead Free Status / RoHS StatusLead free / RoHS Compliant
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Page 98/352

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abled the CPU will access the OCR1x directly. The content of the OCR1x (Buffer or Compare)
Register is only changed by a write operation (the Timer/Counter does not update this register
automatically as the TCNT1 and ICR1 Register). Therefore OCR1x is not read via the High byte
temporary register (TEMP). However, it is a good practice to read the Low byte first as when
accessing other 16-bit registers. Writing the OCR1x Registers must be done via the TEMP Reg-
ister since the compare of all 16 bits is done continuously. The High byte (OCR1xH) has to be
written first. When the High byte I/O location is written by the CPU, the TEMP Register will be
updated by the value written. Then when the Low byte (OCR1xL) is written to the lower eight
bits, the High byte will be copied into the upper 8-bits of either the OCR1x buffer or OCR1x Com-
pare Register in the same system clock cycle.
For more information of how to access the 16-bit registers refer to
on page
16.7.1
Force Output Compare
In non-PWM Waveform Generation modes, the match output of the comparator can be forced by
writing a one to the Force Output Compare (FOC1x) bit. Forcing compare match will not set the
OCF1x Flag or reload/clear the timer, but the OC1x pin will be updated as if a real compare
match had occurred (the COM1x1:0 bits settings define whether the OC1x pin is set, cleared or
toggled).
16.7.2
Compare Match Blocking by TCNT1 Write
All CPU writes to the TCNT1 Register will block any compare match that occurs in the next timer
clock cycle, even when the timer is stopped. This feature allows OCR1x to be initialized to the
same value as TCNT1 without triggering an interrupt when the Timer/Counter clock is enabled.
16.7.3
Using the Output Compare Unit
Since writing TCNT1 in any mode of operation will block all compare matches for one timer clock
cycle, there are risks involved when changing TCNT1 when using any of the output compare
units, independent of whether the Timer/Counter is running or not. If the value written to TCNT1
equals the OCR1x value, the compare match will be missed, resulting in incorrect waveform
generation. Do not write the TCNT1 equal to TOP in PWM modes with variable TOP values. The
compare match for the TOP will be ignored and the counter will continue to 0xFFFF. Similarly,
do not write the TCNT1 value equal to BOTTOM when the counter is downcounting.
The setup of the OC1x should be performed before setting the Data Direction Register for the
port pin to output. The easiest way of setting the OC1x value is to use the force output compare
(FOC1x) strobe bits in Normal mode. The OC1x Register keeps its value even when changing
between waveform generation modes.
Be aware that the COM1x1:0 bits are not double buffered together with the compare value.
Changing the COM1x1:0 bits will take effect immediately.
16.8
Compare Match Output Unit
The Compare Output mode (COM1x1:0) bits have two functions. The Waveform Generator uses
the COM1x1:0 bits for defining the Output Compare (OC1x) state at the next compare match.
Secondly the COM1x1:0 bits control the OC1x pin output source.
schematic of the logic affected by the COM1x1:0 bit setting. The I/O Registers, I/O bits, and I/O
pins in the figure are shown in bold. Only the parts of the general I/O Port Control Registers
(DDR and PORT) that are affected by the COM1x1:0 bits are shown. When referring to the
ATmega16A
98
91.
“Accessing 16-bit Registers”
Figure 16-5
shows a simplified
8154B–AVR–07/09