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 185/352

Download datasheet (8Mb)Embed
PrevNext
• When the TWINT Flag is set, the user must update all TWI Registers with the value relevant
for the next TWI bus cycle. As an example, TWDR must be loaded with the value to be
transmitted in the next bus cycle.
• After all TWI Register updates and other pending application software tasks have been
completed, TWCR is written. When writing TWCR, the TWINT bit should be set. Writing a
one to TWINT clears the flag. The TWI will then commence executing whatever operation
was specified by the TWCR setting.
In the following an assembly and C implementation of the example is given. Note that the code
below assumes that several definitions have been made, for example by using include-files.
Assembly code example
ldi
r16, (1<<TWINT)|(1<<TWSTA)|
1
(1<<TWEN)
out
TWCR, r16
wait1:
2
in
r16,TWCR
sbrs r16,TWINT
rjmp wait1
in
r16,TWSR
3
andi r16, 0xF8
cpi
r16, START
brne ERROR
r16, SLA_W
ldi
out
TWDR, r16
ldi
r16, (1<<TWINT) | (1<<TWEN)
out
TWCR, r16
wait2:
4
in
r16,TWCR
sbrs r16,TWINT
rjmp wait2
in
r16,TWSR
5
andi r16, 0xF8
cpi
r16, MT_SLA_ACK
brne ERROR
ldi
r16, DATA
out
TWDR, r16
r16, (1<<TWINT) | (1<<TWEN)
ldi
out
TWCR, r16
wait3:
6
in
r16,TWCR
sbrs r16,TWINT
rjmp wait3
in
r16,TWSR
7
andi r16, 0xF8
cpi
r16, MT_DATA_ACK
brne ERROR
ldi
r16, (1<<TWINT)|(1<<TWEN)|
(1<<TWSTO)
out
TWCR, r16
8154B–AVR–07/09
C example
TWCR = (1<<TWINT)|(1<<TWSTA)|
(1<<TWEN)
while (!(TWCR & (1<<TWINT)))
;
if ((TWSR & 0xF8) != START)
ERROR();
TWDR = SLA_W;
TWCR = (1<<TWINT) | (1<<TWEN);
while (!(TWCR & (1<<TWINT)))
;
if ((TWSR & 0xF8) != MT_SLA_ACK)
ERROR();
TWDR = DATA;
TWCR = (1<<TWINT) | (1<<TWEN);
while (!(TWCR & (1<<TWINT)))
;
if ((TWSR & 0xF8) != MT_DATA_ACK)
ERROR();
TWCR = (1<<TWINT)|(1<<TWEN)|
(1<<TWSTO);
ATmega16A
Comments
Send START condition
Wait for TWINT Flag set. This indicates
that the START condition has been
transmitted
Check value of TWI Status Register. Mask
prescaler bits. If status different from
START go to ERROR
Load SLA_W into TWDR Register. Clear
TWINT bit in TWCR to start transmission
of address
Wait for TWINT Flag set. This indicates
that the SLA+W has been transmitted,
and ACK/NACK has been received.
Check value of TWI Status Register. Mask
prescaler bits. If status different from
MT_SLA_ACK go to ERROR
Load DATA into TWDR Register. Clear
TWINT bit in TWCR to start transmission
of data
Wait for TWINT Flag set. This indicates
that the DATA has been transmitted, and
ACK/NACK has been received.
Check value of TWI Status Register. Mask
prescaler bits. If status different from
MT_DATA_ACK go to ERROR
Transmit STOP condition
185