ATTINY261A-MN Atmel, ATTINY261A-MN Datasheet - Page 125
![no-image](/images/manufacturer_photos/0/0/78/atmel_sml.jpg)
ATTINY261A-MN
Manufacturer Part Number
ATTINY261A-MN
Description
IC MCU AVR 2K FLASH 32QFN
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY261A-MN
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT
Number Of I /o
16
Program Memory Size
2KB (1K x 16)
Program Memory Type
FLASH
Eeprom Size
128 x 8
Ram Size
128 x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Processor Series
ATtiny
Core
AVR
Data Bus Width
8 bit
Data Ram Size
128 B, 256 B, 512 B
Interface Type
SPI, USI
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
16
Number Of Timers
2
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 105 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 105 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATTINY261A-MN
Manufacturer:
Atmel
Quantity:
771
- Current page: 125 of 292
- Download datasheet (9Mb)
13.3.2
8197B–AVR–01/10
SPI Master Operation Example
Figure 13-3. Three-wire Mode, Timing Diagram
The Three-wire mode timing is shown in Figure 13-3. At the top of the figure is a USCK cycle ref-
erence. One bit is shifted into the USI Data Register (USIDR) for each of these cycles. The
USCK timing is shown for both external clock modes. In External Clock mode 0 (USICS0 = 0), DI
is sampled at positive edges, and DO is changed (Data Register is shifted by one) at negative
edges. In external clock mode 1 (USICS0 = 1) the opposite edges with respect to mode 0 are
used. In other words, data is sampled at negative and output is changed at positive edges. The
USI clock modes corresponds to the SPI data mode 0 and 1.
Referring to the timing diagram
The following code demonstrates how to use the USI module as a SPI Master:
CYCLE
1. The slave and master devices set up their data outputs and, depending on the protocol
2. The master software generates a clock pulse by toggling the USCK line twice (C and
3. Step 2. is repeated eight times for a complete register (byte) transfer.
4. After eight clock pulses (i.e., 16 clock edges) the counter will overflow and indicate that
USCK
USCK
SPITransfer:
SPITransfer_loop:
DO
DI
used, enable their output drivers (mark A and B). The output is set up by writing the
data to be transmitted to the USI Data Register. The output is enabled by setting the
corresponding bit in the Data Direction Register of Port A. Note that there is not a pre-
ferred order of points A and B in the figure, but both must be at least one half USCK
cycle before point C, where the data is sampled. This is in order to ensure that the data
setup requirement is satisfied. The 4-bit counter is reset to zero.
D). The bit values on the data input (DI) pins are sampled by the USI on the first edge
(C), and the data output is changed on the opposite edge (D). The 4-bit counter will
count both edges.
the transfer has been completed. The data bytes transferred must now be processed
before a new transfer can be initiated. The overflow interrupt will wake up the processor
if it is set to Idle mode. Depending on the protocol used the slave device can now set its
output to high impedance.
sts
ldi
sts
ldi
sts
lds
( Reference )
A
USIDR,r16
r16,(1<<USIOIF)
USISR,r16
r16,(1<<USIWM0)|(1<<USICS1)|(1<<USICLK)|(1<<USITC)
USICR,r16
r16, USISR
B
MSB
MSB
C
1
D
2
6
6
(Figure
3
5
5
13-3), a bus transfer involves the following steps:
4
4
4
5
3
3
6
2
2
7
1
1
LSB
LSB
8
E
125
Related parts for ATTINY261A-MN
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ATtiny26](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
![ATTINY26-16MU](/photos/12/13/121313/attiny26-16mu_tmb.jpg)
Part Number:
Description:
IC AVR MCU 2K 16MHZ IND 32-QFN
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16SU](/photos/6/80/68042/453-20-soic_tmb.jpg)
Part Number:
Description:
IC AVR MCU 2K 16MHZ IND 20-SOIC
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16PU](/photos/6/80/68043/313-20-dip_tmb.jpg)
Part Number:
Description:
IC AVR MCU 2K 16MHZ IND 20-DIP
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16MI](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
IC AVR MCU 2K 16MHZ IND 32-QFN
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16PI](/photos/6/80/68043/313-20-dip_tmb.jpg)
Part Number:
Description:
IC AVR MCU 2K 16MHZ IND 20-DIP
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16SC](/photos/6/80/68042/453-20-soic_tmb.jpg)
Part Number:
Description:
IC AVR MCU 2K 16MHZ COM 20-SOIC
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16SI](/photos/6/80/68042/453-20-soic_tmb.jpg)
Part Number:
Description:
IC AVR MCU 2K 16MHZ IND 20-SOIC
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16MJ](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
ID MCU AVR 2K 5V 16MHZ 32-QFN
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16MQ](/photos/30/99/309943/qfn-32_tmb.jpg)
Part Number:
Description:
Microcontrollers (MCU) AVR 2K FLASH 128B EE 128B SRAM ADC
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16MC](/photos/12/13/121302/attiny26-16mc_tmb.jpg)
Part Number:
Description:
IC AVR MCU 2K 16MHZ COM 32-QFN
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16PC](/photos/6/80/68043/313-20-dip_tmb.jpg)
Part Number:
Description:
IC AVR MCU 2K 16MHZ COM 20-DIP
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16PJ](/photos/6/80/68043/313-20-dip_tmb.jpg)
Part Number:
Description:
ID MCU AVR 2K 5V 16MHZ 20-DIP
Manufacturer:
Atmel
Datasheet:
![ATTINY26-16SJ](/photos/6/80/68042/453-20-soic_tmb.jpg)
Part Number:
Description:
ID MCU AVR 2K 5V 16MHZ 20-SOIC
Manufacturer:
Atmel
Datasheet: