ATTINY25-20SUR Atmel, ATTINY25-20SUR Datasheet - Page 113

• Manufacturer Part Number: ATTINY25-20SUR
• Description: MCU AVR 2KB FLASH 20MHZ 8SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY25-20SUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 6
• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

15.3.2
2586M–AVR–07/10
SPI Master Operation Example
Figure 15-3. Three-Wire Mode, Timing Diagram
The three-wire mode timing is shown in
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 (USI Data Register is shifted by one) at nega-
tive 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 changes the output 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 as an SPI Master:
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
SPITransfer:
SPITransfer_loop:
CYCLE
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 B. 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. If USI Buffer Registers are not used the data bytes
that have been transferred must now be processed before a new transfer can be initi-
ated. The overflow interrupt will wake up the processor if it is set to Idle mode.
Depending of the protocol used the slave device can now set its output to high
impedance.
USCK
USCK
out
ldi
out
ldi
out
in
DO
DI
( Reference )
r16, USISR
A
USIDR,r16
r16,(1<<USIOIF)
USISR,r16
r16,(1<<USIWM0)|(1<<USICS1)|(1<<USICLK)|(1<<USITC)
USICR,r16
B
MSB
MSB
C
1
D
(Figure
2
6
6
15-3), a bus transfer involves the following steps:
3
Figure 15-3
5
5
4
4
4
At the top of the figure is a USCK cycle ref-
5
3
3
6
2
2
7
1
1
LSB
LSB
8
E
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