ATTINY25V-15ST Atmel, ATTINY25V-15ST Datasheet - Page 103
ATTINY25V-15ST
Manufacturer Part Number
ATTINY25V-15ST
Description
MCU AVR 2K FLASH 4MHZ 8-SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Datasheet
1.ATTINY25-15MZ.pdf
(196 pages)
Specifications of ATTINY25V-15ST
Package / Case
8-SOIC (3.9mm Width)
Voltage - Supply (vcc/vdd)
1.8 V ~ 3.6 V
Operating Temperature
-40°C ~ 85°C
Speed
8MHz
Number Of I /o
6
Eeprom Size
128 x 8
Core Processor
AVR
Program Memory Type
FLASH
Ram Size
128 x 8
Program Memory Size
2KB (2K x 8)
Data Converters
A/D 4x10b
Oscillator Type
Internal
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Connectivity
USI
Core Size
8-Bit
Processor Series
ATTINY2x
Core
AVR8
Data Bus Width
8 bit
Data Ram Size
128 B
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATTINY25V-15ST
Manufacturer:
ATMEL/爱特梅尔
Quantity:
20 000
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16.3
16.3.1
16.3.2
16.3.3
16.3.4
16.3.5
16.4
16.4.1
7598H–AVR–07/09
Alternative USI Usage
USI Register Descriptions
Half-duplex Asynchronous Data Transfer
4-bit Counter
12-bit Timer/Counter
Edge Triggered External Interrupt
Software Interrupt
USI Data Register – USIDR
When the USI unit is not used for serial communication, it can be set up to do alternative tasks
due to its flexible design.
By utilizing the Shift Register in Three-wire mode, it is possible to implement a more compact
and higher performance UART than by software only.
The 4-bit counter can be used as a stand-alone counter with overflow interrupt. Note that if the
counter is clocked externally, both clock edges will generate an increment.
Combining the USI 4-bit counter and Timer/Counter0 allows them to be used as a 12-bit
counter.
By setting the counter to maximum value (F) it can function as an additional external interrupt.
The Overflow Flag and Interrupt Enable bit are then used for the external interrupt. This feature
is selected by the USICS1 bit.
The counter overflow interrupt can be used as a software interrupt triggered by a clock strobe.
When accessing the USI Data Register (USIDR) the Serial Register can be accessed directly. If
a serial clock occurs at the same cycle the register is written, the register will contain the value
written and no shift is performed. A (left) shift operation is performed depending of the
USICS1..0 bits setting. The shift operation can be controlled by an external clock edge, by a
Timer/Counter0 Compare Match, or directly by software using the USICLK strobe bit. Note that
even when no wire mode is selected (USIWM1..0 = 0) both the external data input (DI/SDA) and
the external clock input (USCK/SCL) can still be used by the Shift Register.
The output pin in use, DO or SDA depending on the wire mode, is connected via the output latch
to the most significant bit (bit 7) of the Data Register. The output latch is open (transparent) dur-
ing the first half of a serial clock cycle when an external clock source is selected (USICS1 = 1),
and constantly open when an internal clock source is used (USICS1 = 0). The output will be
changed immediately when a new MSB written as long as the latch is open. The latch ensures
that data input is sampled and data output is changed on opposite clock edges.
Note that the corresponding Data Direction Register to the pin must be set to one for enabling
data output from the Shift Register.
Bit
Read/Write
Initial Value
MSB
R/W
7
0
R/W
6
0
R/W
5
0
R/W
4
0
R/W
3
0
R/W
2
0
ATtiny25/45/85
R/W
1
0
LSB
R/W
0
0
USIDR
103
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