ATMEGA16A-PU Atmel, ATMEGA16A-PU Datasheet - Page 196

MCU AVR 16K FLASH 16MHZ 40-PDIP

ATMEGA16A-PU

Manufacturer Part Number
ATMEGA16A-PU
Description
MCU AVR 16K FLASH 16MHZ 40-PDIP
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA16A-PU

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
16KB (8K x 16)
Program Memory Type
FLASH
Eeprom Size
512 x 8
Ram Size
1K 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
40-DIP (0.600", 15.24mm)
Processor Series
ATMEGA16x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
1 KB
Interface Type
2-Wire/SPI/USART
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
32
Number Of Timers
3
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
3rd Party Development Tools
EWAVR, EWAVR-BL
Development Tools By Supplier
ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
Minimum Operating Temperature
- 40 C
On-chip Adc
8-ch x 10-bit
Package
40PDIP
Device Core
AVR
Family Name
ATmega
Maximum Speed
16 MHz
Operating Supply Voltage
3.3|5 V
Controller Family/series
AVR MEGA
No. Of I/o's
32
Eeprom Memory Size
512Byte
Ram Memory Size
1KB
Cpu Speed
16MHz
Rohs Compliant
Yes
For Use With
ATSTK600 - DEV KIT FOR AVR/AVR32ATSTK500 - PROGRAMMER AVR STARTER KIT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA16A-PU
Manufacturer:
ATMEL
Quantity:
10 000
Company:
Part Number:
ATMEGA16A-PU
Manufacturer:
ATMEL
Quantity:
9 800
Part Number:
ATMEGA16A-PU
Manufacturer:
ATMEL
Quantity:
500
196
ATmega16A
The upper seven bits are the address to which the Two-wire Serial Interface will respond when
addressed by a Master. If the LSB is set, the TWI will respond to the general call address ($00),
otherwise it will ignore the general call address.
TWEN must be written to one to enable the TWI. The TWEA bit must be written to one to enable
the acknowledgement of the device’s own Slave address or the general call address. TWSTA
and TWSTO must be written to zero.
When TWAR and TWCR have been initialized, the TWI waits until it is addressed by its own
Slave address (or the general call address if enabled) followed by the data direction bit. If the
direction bit is “1” (read), the TWI will operate in ST mode, otherwise SR mode is entered. After
its own Slave address and the write bit have been received, the TWINT Flag is set and a valid
status code can be read from TWSR. The status code is used to determine the appropriate soft-
ware action. The appropriate action to be taken for each status code is detailed in
The Slave Transmitter mode may also be entered if arbitration is lost while the TWI is in the
Master mode (see state $B0).
If the TWEA bit is written to zero during a transfer, the TWI will transmit the last byte of the trans-
fer. State $C0 or state $C8 will be entered, depending on whether the Master Receiver transmits
a NACK or ACK after the final byte. The TWI is switched to the not addressed Slave mode, and
will ignore the Master if it continues the transfer. Thus the Master Receiver receives all “1” as
serial data. State $C8 is entered if the Master demands additional data bytes (by transmitting
ACK), even though the Slave has transmitted the last byte (TWEA zero and expecting NACK
from the Master).
While TWEA is zero, the TWI does not respond to its own Slave address. However, the Two-
wire Serial Bus is still monitored and address recognition may resume at any time by setting
TWEA. This implies that the TWEA bit may be used to temporarily isolate the TWI from the Two-
wire Serial Bus.
In all sleep modes other than Idle mode, the clock system to the TWI is turned off. If the TWEA
bit is set, the interface can still acknowledge its own Slave address or the general call address
by using the Two-wire Serial Bus clock as a clock source. The part will then wake up from sleep
and the TWI will hold the SCL clock will low during the wake up and until the TWINT Flag is
cleared (by writing it to one). Further data transmission will be carried out as normal, with the
AVR clocks running as normal. Observe that if the AVR is set up with a long start-up time, the
SCL line may be held low for a long time, blocking other data transmissions.
Note that the Two-wire Serial Interface Data Register – TWDR does not reflect the last byte
present on the bus when waking up from these sleep modes.
TWAR
Value
TWCR
Value
TWINT
TWA6
0
TWEA
TWA5
1
TWSTA
TWA4
0
Device’s Own Slave Address
TWSTO
TWA3
0
TWWC
TWA2
0
TWEN
TWA1
1
TWA0
0
8154B–AVR–07/09
Table
TWGCE
TWIE
X
20-5.

Related parts for ATMEGA16A-PU