ATTINY25-20SUR Atmel, ATTINY25-20SUR Datasheet - Page 28

• Manufacturer Part Number: ATTINY25-20SUR
• Description: MCU AVR 2KB FLASH 20MHZ 8SOIC
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY25-20SUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 6
• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 4x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

28
ATtiny25/45/85
Mode” on page
divided by four, providing a 1.6 MHz system clock.
Table 6-6.
Note:
When the calibrated 8 MHz internal oscillator is selected as clock source the start-up times are
determined by the SUT Fuses as shown in
Table 6-7.
Note:
In ATtiny15 Compatibility Mode start-up times are determined by SUT fuses as shown in
6-8
Table 6-8.
Note:
In summary, more information on ATtiny15 Compatibility Mode can be found in sections
(PB5:PB0)” on page
Timer/Counter1 in ATtiny15 Mode” on page
bration Bytes” on page 154
SUT[1:0]
SUT[1:0]
10
below.
00
01
11
00
01
10
11
(2)
1. The device is shipped with this option selected.
2. This setting will select ATtiny15 Compatibility Mode, where system clock is divided by four,
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to 14CK + 4 ms to
2. The device is shipped with this option selected.
1. If the RSTDISBL fuse is programmed, this start-up time will be increased to 14CK + 4 ms to
resulting in a 1.6 MHz clock frequency.
ensure programming mode can be entered.
ensure programming mode can be entered.
CKSEL[3:0]
Internal Calibrated RC Oscillator Operating Modes
Start-up Times for Internal Calibrated RC Oscillator Clock
Start-up Times for Internal Calibrated RC Oscillator Clock (in ATtiny15 Mode)
0010
0011
98). Note that in this mode of operation the 6.4 MHz clock signal is always
from Power-down
from Power-down
(1)
(2)
Start-up Time
Start-up Time
2,
6 CK
6 CK
6 CK
6 CK
6 CK
6 CK
1 CK
“Internal PLL in ATtiny15 Compatibility Mode” on page
and in table
“Clock Prescaler Select” on page
Table 6-7
98,
Additional Delay from
Additional Delay from
Reset (V
Reset (V
“Limitations of debugWIRE” on page
Reserved
14CK + 64 ms
14CK + 64 ms
14CK + 64 ms
14CK + 4 ms
14CK + 4 ms
14CK
14CK
below.
CC
CC
Nominal Frequency
(1)
(1)
= 5.0V)
= 5.0V)
8.0 MHz
6.4 MHz
Recommended Usage
BOD enabled
Fast rising power
Slowly rising power
Recommended Usage
34.
2586M–AVR–07/10
144,
24,
“Port B
“8-bit
Table
“Cali-