ATTINY20-MMHR Atmel, ATTINY20-MMHR Datasheet - Page 45

• Manufacturer Part Number: ATTINY20-MMHR
• Description: MCU AVR 2KB FLASH 12MHZ 20QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY20-MMHR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 12MHz
• Connectivity: I²C, SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 12
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Ram Size: 128 x 8
• Voltage - Supply (vcc/vdd): 1.8 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
• Eeprom Size: -

10.2
10.2.1
8235B–AVR–04/11
Ports as General Digital I/O
Configuring the Pin
The ports are bi-directional I/O ports with optional internal pull-ups.
tional description of one I/O-port pin, here generically called Pxn.
Figure 10-2. General Digital I/O
Note:
Each port pin consists of four register bits: DDxn, PORTxn, PUExn, and PINxn. As shown in
“Register Description” on page
PORTxn bits at the PORTx I/O address, the PUExn bits at the PUEx I/O address, and the PINxn
bits at the PINx I/O address.
Pxn
1. WEx, WRx, WPx, WDx, REx, RRx, RPx, and RDx are common to all pins within the same
port. clk
SLEEP:
clk
I/O
I/O
:
, and SLEEP are common to all ports.
SLEEP CONTROL
I/O CLOCK
SLEEP
58, the DDxn bits are accessed at the DDRx I/O address, the
(1)
SYNCHRONIZER
D
L
Q
Q
D
PINxn
Q
Q
RESET
RESET
RESET
PORTxn
WEx:
REx:
WDx:
RDx:
WRx:
RRx:
RPx:
WPx:
Q
Q
Q
Q
Q
Q
PUExn
DDxn
CLR
CLR
CLR
D
D
D
REx
RRx
WRITE PUEx
READ PUEx
WRITE DDRx
READ DDRx
WRITE PORTx
READ PORTx REGISTER
READ PORTx PIN
WRITE PINx REGISTER
Figure 10-2
clk
WEx
WDx
RDx
RPx
1
0
I/O
WRx
ATtiny20
shows a func-
WPx
45