ATMEGA48P-20MMUR Atmel, ATMEGA48P-20MMUR Datasheet - Page 77
![MCU AVR 4K FLASH 20MHZ 28QFN](/photos/12/32/123209/28m1-vqfn_sml.jpg)
ATMEGA48P-20MMUR
Manufacturer Part Number
ATMEGA48P-20MMUR
Description
MCU AVR 4K FLASH 20MHZ 28QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheet
1.ATMEGA168P-20AU.pdf
(420 pages)
Specifications of ATMEGA48P-20MMUR
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
23
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 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
*
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
- Current page: 77 of 420
- Download datasheet (9Mb)
13.2.5
13.2.6
8025L–AVR–7/10
Digital Input Enable and Sleep Modes
Unconnected Pins
Note:
As shown in
Schmitt Trigger. The signal denoted SLEEP in the figure, is set by the MCU Sleep Controller in
Power-down mode, Power-save mode, and Standby mode to avoid high power consumption if
some input signals are left floating, or have an analog signal level close to V
SLEEP is overridden for port pins enabled as external interrupt pins. If the external interrupt
request is not enabled, SLEEP is active also for these pins. SLEEP is also overridden by various
other alternate functions as described in
If a logic high level (“one”) is present on an asynchronous external interrupt pin configured as
“Interrupt on Rising Edge, Falling Edge, or Any Logic Change on Pin” while the external interrupt
is not enabled, the corresponding External Interrupt Flag will be set when resuming from the
above mentioned Sleep mode, as the clamping in these sleep mode produces the requested
logic change.
If some pins are unused, it is recommended to ensure that these pins have a defined level. Even
though most of the digital inputs are disabled in the deep sleep modes as described above, float-
Assembly Code Example
C Code Example
unsigned char i;
...
; Define pull-ups and set outputs high
; Define directions for port pins
ldi
ldi
out
out
; Insert nop for synchronization
nop
; Read port pins
in
...
...
/* Define pull-ups and set outputs high */
/* Define directions for port pins */
PORTB = (1<<PB7)|(1<<PB6)|(1<<PB1)|(1<<PB0);
DDRB = (1<<DDB3)|(1<<DDB2)|(1<<DDB1)|(1<<DDB0);
/* Insert nop for synchronization*/
__no_operation();
/* Read port pins */
i = PINB;
...
1. For the assembly program, two temporary registers are used to minimize the time from pull-
ups are set on pins 0, 1, 6, and 7, until the direction bits are correctly set, defining bit 2 and 3
as low and redefining bits 0 and 1 as strong high drivers.
Figure
r16,(1<<PB7)|(1<<PB6)|(1<<PB1)|(1<<PB0)
r17,(1<<DDB3)|(1<<DDB2)|(1<<DDB1)|(1<<DDB0)
PORTB,r16
DDRB,r17
r16,PINB
13-2, the digital input signal can be clamped to ground at the input of the
(1)
”Alternate Port Functions” on page
ATmega48P/88P/168P
CC
78.
/2.
77
Related parts for ATMEGA48P-20MMUR
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ATmega48P](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
![ATMEGA48P-20MU](/photos/12/13/121314/atmega48p-20mu_tmb.jpg)
Part Number:
Description:
MCU AVR 4K ISP FLASH 20MHZ 32QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20AU](/photos/6/91/69154/313-32-tqfp_tmb.jpg)
Part Number:
Description:
MCU AVR 4K ISP FLSH 20MHZ 32TQFP
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20PU](/photos/7/21/72189/453-28-dip_tmb.jpg)
Part Number:
Description:
MCU AVR 4K ISP FLASH 20MHZ 28DIP
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20AUR](/photos/6/91/69154/313-32-tqfp_tmb.jpg)
Part Number:
Description:
MCU AVR 4K FLASH 20MHZ 32TQFP
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20MUR](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
MCU AVR 4K FLASH 20MHZ 32QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20MMU](/photos/12/32/123209/28m1-vqfn_tmb.jpg)
Part Number:
Description:
MCU AVR 4K FLASH 20MHZ 28-QFN
Manufacturer:
Atmel
Datasheet:
![ATSTK600](/photos/9/20/92038/atstk600_tmb.jpg)
Part Number:
Description:
DEV KIT FOR AVR/AVR32
Manufacturer:
Atmel
Datasheet:
![U641B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
![U4082B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet:
![U4089B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
MONOLITHIC INTEGRATED FEATUREPHONE CIRCUIT
Manufacturer:
ATMEL Corporation
Datasheet:
![U4255BM-M](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
AM-FM Receiver IC U4255BM-M
Manufacturer:
ATMEL Corporation
Datasheet: