ATTINY20-XU Atmel, ATTINY20-XU Datasheet - Page 162

• Manufacturer Part Number: ATTINY20-XU
• Description: MCU AVR 2KB FLASH 12MHZ 14TSSOP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY20-XU

• 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: *
• Processor Series: ATtiny
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 128 B
• Interface Type: SPI, TWI
• Maximum Clock Frequency: 12 MHz
• Number Of Programmable I/os: 12
• Number Of Timers: 2
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Details

18.7.3
162
ATtiny20
TPISR – Tiny Programming Interface Status Register
Table 18-13. Guard Time Settings
The default Guard Time is 128 IDLE bits. To speed up the communication, the Guard Time
should be set to the shortest safe value.
• Bits 7:2, 0 – Res: Reserved Bits
These bits are reserved and will always read as zero.
• Bit 1 – NVMEN: Non-Volatile Memory Programming Enabled
NVM programming is enabled when this bit is set. The external programmer can poll this bit to
verify the interface has been successfully enabled.
NVM programming is disabled by writing this bit to zero.
Bit
CSS: 0x00
Read/Write
Initial Value
GT2
1
1
1
R
7
–
0
R
GT1
6
–
0
0
1
1
R
5
–
0
R
4
–
0
GT0
1
0
1
R
3
–
0
Guard Time (Number of IDLE bits)
+4
+2
+0
R
2
–
0
NVMEN
R/W
1
0
R
0
–
0
TPIPCR
8235B–AVR–04/11