ATMEGA169P-16MCH Atmel, ATMEGA169P-16MCH Datasheet - Page 45

• Manufacturer Part Number: ATMEGA169P-16MCH
• Description: MCU AVR 16KB FLASH 16MHZ 64-VQFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA169P-16MCH

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-VQFN Exposed Pad, 64-HVQFN, 64-SQFN, 64-DHVQFN
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32ATAVRBFLY - KIT EVALUATION AVR BUTTERFLYATSTK502 - MOD EXPANSION AVR STARTER 500ATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.9
9.9.1
9.9.2
8018P–AVR–08/10
Register Description
SMCR – Sleep Mode Control Register
PRR – Power Reduction Register
The Sleep Mode Control Register contains control bits for power management.
• Bits 3, 2, 1 – SM2:0: Sleep Mode Select Bits 2, 1, and 0
These bits select between the five available sleep modes as shown in
Table 9-2.
Note:
• Bit 1 – 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.
• Bit 7:5 - Res: Reserved bits
These bits are reserved and will always read as zero.
• Bit 4 - PRLCD: Power Reduction LCD
Writing logic one to this bit shuts down the LCD controller. The LCD controller must be disabled
and the display discharged before shut down. See
on how to disable the LCD controller.
Bit
0x33 (0x53)
Read/Write
Initial Value
Bit
(0x64)
Read/Write
Initial Value
SM2
0
0
0
0
1
1
1
1
1. Standby mode is only recommended for use with external crystals or resonators.
Sleep Mode Select
R
R
7
–
0
7
–
0
SM1
0
0
1
1
0
0
1
1
R
6
–
0
R
6
–
0
R
5
–
0
R
5
–
0
SM0
0
1
0
1
0
1
0
1
PRLCD
R/W
4
0
R
4
–
0
Sleep Mode
Idle
ADC Noise Reduction
Power-down
Power-save
Reserved
Reserved
Standby
Reserved
PRTIM1
R/W
”Disabling the LCD” on page 244
SM2
R/W
3
0
3
0
(1)
PRSPI
R/W
SM1
2
0
R/W
2
0
PRUSART0
SM0
Table
R/W
ATmega169P
R/W
1
0
1
0
9-2.
R/W
PRADC
SE
0
0
R/W
0
0
for details
SMCR
PRR
45