ATTINY2313A-MUR Atmel, ATTINY2313A-MUR Datasheet - Page 36

• Manufacturer Part Number: ATTINY2313A-MUR
• Description: MCU AVR 2K FLASH 20MHZ 20QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY2313A-MUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 18
• 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
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -

7.5
7.5.1
7.5.2
36
Register Description
ATtiny2313A/4313
MCUCR – MCU Control Register
PRR – Power Reduction Register
For analog input pins, the digital input buffer should be disabled at all times. An analog signal
level close to V
input buffers can be disabled by writing to the Digital Input Disable Register (DIDR). See
– Digital Input Disable Register” on page 168
The Sleep Mode Control Register contains control bits for power management.
• Bits 6, 4 – SM1..0: Sleep Mode Select Bits 1 and 0
These bits select between the four available sleep modes as shown in
Table 7-2.
Note:
• Bit 5 – SE: Sleep Enable
The SE bit must be written to logic one to make the MCU enter the sleep mode when the SLEEP
instruction is executed. To avoid the MCU entering the sleep mode unless it is the programmer’s
purpose, it is recommended to write the Sleep Enable (SE) bit to one just before the execution of
the SLEEP instruction and to clear it immediately after waking up.
The Power Reduction Register provides a method to reduce power consumption by allowing
peripheral clock signals to be disabled.
• Bits 7..4 – Res: Reserved Bits
These bits are reserved and will always read zero.
• Bit 3 – PRTIM1: Power Reduction Timer/Counter1
Writing a logic one to this bit shuts down the Timer/Counter1 module. When the Timer/Counter1
is enabled, operation will continue like before the shutdown.
Bit
0x35 (0x55)
Read/Write
Initial Value
Bit
0x06 (0x26)
Read/Write
Initial Value
SM1
0
0
1
1
Standby mode is only recommended for use with external crystals or resonators.
Sleep Mode Select
PUD
R/W
CC
7
0
R
7
–
0
/2 on an input pin can cause significant current even in active mode. Digital
SM0
0
1
0
1
SM1
R/W
6
0
R
6
–
0
Sleep Mode
Idle
Power-down
Standby
Power-down
R/W
SE
5
0
R
5
–
0
SM0
R/W
0
4
R
4
–
0
for details.
ISC11
R/W
3
0
PRTIM1
R/W
3
0
ISC10
R/W
2
0
PRTIM0
R/W
2
0
ISC01
R/W
1
0
PRUSI
Table
R/W
ISC00
1
0
R/W
0
0
7-2.
PRUSART
MCUCR
R/W
0
0
8246A–AVR–11/09
PRR
“DIDR