Datasheet ATtiny15L (Atmel) - 10

Figure 11.
Single Cycle ALU Operation T1 T2 T3 T4 System Clock Ø Total Execution Time Register Operands Fetch ALU Operation Execute Result Write Back
I/O Memory
The I/O space definition of the ATtiny15L is shown in Table 2.
Table 2.
ATtiny15L I/O Space(1)
Address Hex Name Function
$3F SREG Status Register $3B GIMSK General Interrupt Mask Register $3A GIFR General Interrupt Flag Register $39 TIMSK Timer/Counter Interrupt Mask Register $38 TIFR Timer/Counter Interrupt Flag Register $35 MCUCR MCU Control Register $34 MCUSR MCU Status Register $33 TCCR0 Timer/Counter0 Control Register $32 TCNT0 Timer/Counter0 (8-bit) $31 OSCCAL Oscillator Calibration Register $30 TCCR1 Timer/Counter1 Control Register $2F TCNT1 Timer/Counter1 (8-bit) $2E OCR1A Timer/Counter1 Output Compare Register A $2D OCR1B Timer/Counter1 Output Compare Register B $2C SFIOR Special Function I/O Register $21 WDTCR Watchdog Timer Control Register $1E EEAR EEPROM Address Register $1D EEDR EEPROM Data Register $1C EECR EEPROM Control Register $18 PORTB Data Register, Port B $17 DDRB Data Direction Register, Port B $16 PINB Input Pins, Port B $08 ACSR Analog Comparator Control and Status Register $07 ADMUX ADC Multiplexer Select Register
10 ATtiny15L
1187H–AVR–09/07 Document Outline Features Pin Configuration Description Block Diagram Pin Descriptions VCC GND Port B (PB5..PB0) Analog Pins Internal Oscillators ATtiny15L Architectural Overview The General Purpose Register File The ALU - Arithmetic Logic Unit The Flash Program Memory The Program and Data Addressing Modes Register Direct, Single- register Rd Register Indirect Register Direct, Two Registers Rd and Rr I/O Direct Relative Program Addressing, RJMP and RCALL Constant Addressing using the LPM Instruction Subroutine and Interrupt Hardware Stack The EEPROM Data Memory Memory Access and Instruction Execution Timing I/O Memory The Status Register - SREG Reset and Interrupt Handling ATtiny15L Reset Sources Power-on Reset External Reset Brown-out Detection Watchdog Reset MCU Status Register - MCUSR Internal Voltage Reference Voltage Reference Enable Signals and Start-up Time Interrupt Handling Interrupt Response Time The General Interrupt Mask Register - GIMSK The General Interrupt Flag Register - GIFR The Timer/Counter Interrupt Mask Register - TIMSK The Timer/Counter Interrupt Flag Register - TIFR External Interrupt Pin Change Interrupt The MCU Control Register - MCUCR Sleep Modes Idle Mode ADC Noise Reduction Mode Power-down Mode Tuneable Internal RC Oscillator The System Clock Oscillator Calibration Register - OSCCAL Internal PLL for Fast Peripheral Clock Generation Timer/Counters The Timer/Counter0 Prescaler The Timer/Counter1 Prescaler The Special Function IO Register - SFIOR The 8-bit Timer/Counter0 The Timer/Counter0 Control Register - TCCR0 The Timer Counter 0 - TCNT0 The 8-bit Timer/Counter1 The Timer/Counter1 Control Register - TCCR1 The Timer/Counter1 - TCNT1 Timer/Counter1 Output Compare RegisterA - OCR1A Timer/Counter1 in PWM Mode Timer/Counter1 Output Compare RegisterB - OCR1B The Watchdog Timer The Watchdog Timer Control Register - WDTCR EEPROM Read/Write Access The EEPROM Address Register - EEAR The EEPROM Data Register - EEDR The EEPROM Control Register - EECR Preventing EEPROM Corruption The Analog Comparator The Analog Comparator Control and Status Register - ACSR The Analog-to-Digital Converter, Analog Multiplexer, and Gain Stages Features Operation Prescaling and Conversion Timing ADC Noise Canceler Function The ADC Multiplexer Selection Register - ADMUX The ADC Control and Status Register - ADCSR The ADC Data Register - ADCL and ADCH ADLAR = 0 ADLAR = 1 Scanning Multiple Channels ADC Noise-canceling Techniques ADC Characteristics I/O Port B Unconnected Pins Alternative Functions of Port B The Port B Data Register - PORTB The Port B Data Direction Register - DDRB The Port B Input Pins Address - PINB PORT B as General Digital I/O Alternate Functions of Port B Memory Programming Program and Data Memory Lock Bits Fuse Bits Signature Bytes Calibration Byte Programming the Flash High-voltage Serial Programming High-voltage Serial Programming Algorithm High-voltage Serial Programming Characteristics Low-voltage Serial Downloading Low-voltage Serial Programming Algorithm Data Polling Low-voltage Serial Programming Characteristics Electrical Characteristics Absolute Maximum Ratings DC Characteristics Typical Characteristics ATtiny15L Register Summary ATtiny15L Instruction Set Summary Ordering Information Packaging Information 8P3 8S2 Datasheet revision history Rev H - 09/07 Rev G - 06/07 Rev F - 06/05 Table of Contents