ATTINY25-20SUR Atmel, ATTINY25-20SUR Datasheet - Page 159

• 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

20.7
20.7.1
2586M–AVR–07/10
High-voltage Serial Programming Algorithm
Enter High-voltage Serial Programming Mode
Figure 20-3. High-voltage Serial Programming
Table 20-13. Pin Name Mapping
The minimum period for the Serial Clock Input (SCI) during High-voltage Serial Programming is
220 ns.
Table 20-14. Pin Values Used to Enter Programming Mode
To program and verify the ATtiny25/45/85 in the High-voltage Serial Programming mode, the fol-
lowing sequence is recommended (See instruction formats in
The following algorithm puts the device in High-voltage Serial Programming mode:
Signal Name in High-voltage
Serial Programming Mode
SDI
SII
SDO
SCI
Pin
SDI
SII
SDO
1. Set Prog_enable pins listed in
2. Apply 4.5 - 5.5V between V
the next 20 µs.
SCI
+11.5 - 12.5V
Symbol
Prog_enable[0]
Prog_enable[1]
Prog_enable[2]
CC
PB5
PB3
GND
and GND. Ensure that V
Table 20-14
Pin Name
PB0
PB1
PB2
PB3
(RESET)
to “000”, RESET pin and V
I/O
I
I
O
I
VCC
PB2
PB1
PB0
Function
Serial Data Input
Serial Instruction Input
Serial Data Output
Serial Clock Input (min. 220ns period)
CC
+4.5 - 5.5V
Table
reaches at least 1.8V within
20-16):
SDO
SII
SDI
CC
to 0V.
Value
0
0
0
159