ATTINY26-16SC Atmel, ATTINY26-16SC Datasheet - Page 88
![IC AVR MCU 2K 16MHZ COM 20-SOIC](/photos/6/80/68042/453-20-soic_sml.jpg)
ATTINY26-16SC
Manufacturer Part Number
ATTINY26-16SC
Description
IC AVR MCU 2K 16MHZ COM 20-SOIC
Manufacturer
Atmel
Series
AVR® ATtinyr
Specifications of ATTINY26-16SC
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
USI
Peripherals
Brown-out Detect/Reset, POR, PWM, 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)
4.5 V ~ 5.5 V
Data Converters
A/D 11x10b
Oscillator Type
Internal
Operating Temperature
0°C ~ 70°C
Package / Case
20-SOIC (7.5mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
ATTINY26-16SC
Manufacturer:
MITEL
Quantity:
20 000
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Two-wire Mode
88
ATtiny26(L)
Note that the first two instructions is for initialization only and needs only to be executed
once.These instructions sets Three-wire mode and positive edge Shift Register clock. The loop
is repeated until the USI Counter Overflow Flag is set.
The USI Two-wire mode is compliant to the Inter IC (TWI) bus protocol, but without slew rate lim-
iting on outputs and input noise filtering. Pin names used by this mode are SCL and SDA.
Figure 47. Two-wire Mode Operation, Simplified Diagram
Figure 47 shows two USI units operating in Two-wire mode, one as master and one as slave. It
is only the physical layer that is shown since the system operation is highly dependent of the
communication scheme used. The main differences between the master and slave operation at
this level, is the serial clock generation which is always done by the master, and only the slave
uses the clock control unit. Clock generation must be implemented in software, but the shift
operation is done automatically by both devices. Note that only clocking on negative edge for
shifting data is of practical use in this mode. The slave can insert wait states at start or end of
transfer by forcing the SCL clock low. This means that the master must always check if the SCL
line was actually released after it has generated a positive edge.
Since the clock also increments the counter, a counter overflow can be used to indicate that the
transfer is completed. The clock is generated by the master by toggling the PB2 pin via the
PORTB Register.
The data direction is not given by the physical layer. A protocol, like the one used by the TWI-
bus, must be implemented to control the data flow.
SLAVE
MASTER
Bit7
Bit7
Bit6
Bit6
Bit5
Bit5
Bit4
Bit4
Bit3
Bit3
Bit2
Bit2
Bit1
Bit1
Bit0
Bit0
Two-wire Clock
Control Unit
PORTBz
HOLD
SCL
PBy
PBz
PBy
PBz
SDA
SCL
SDA
SCL
VCC
1477K–AVR–08/10
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