ATTINY20-XU Atmel, ATTINY20-XU Datasheet - Page 161

• 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

18.7.1
18.7.2
8235B–AVR–04/11
TPIIR – Tiny Programming Interface Identification Register
TPIPCR – Tiny Programming Interface Physical Layer Control Register
Table 18-11. Summary of Control and Status Registers (Continued)
• Bits 7:0 – TPIIC: Tiny Programming Interface Identification Code
These bits give the identification code for the Tiny Programming Interface. The code can be
used be the external programmer to identify the TPI. The identification code of the Tiny Pro-
gramming Interface is shown in
Table 18-12. Identification Code for Tiny Programming Interface
• Bits 7:3 – Res: Reserved Bits
These bits are reserved and will always read as zero.
• Bits 2:0 – GT[2:0]: Guard Time
These bits specify the number of additional IDLE bits that are inserted to the idle time when
changing from reception mode to transmission mode. Additional delays are not inserted when
changing from transmission mode to reception.
The total idle time when changing from reception to transmission mode is Guard Time plus two
IDLE bits.
Table 18-13. Guard Time Settings
Bit
CSS: 0x0F
Read/Write
Initial Value
Bit
CSS: 0x02
Read/Write
Initial Value
Addr.
0x02
0x01
0x00
Code
Interface Identification
GT2
0
0
0
0
1
Name
TPIPCR
Reserved
TPISR
Table 18-13
R
R
7
0
7
–
0
Bit 7
shows the available Guard Time settings.
–
–
–
R
R
6
0
6
–
0
GT1
0
0
1
1
0
Programming Interface Identification Code
Bit 6
Table
R
R
5
0
5
–
0
–
–
–
18-12.
R
R
4
0
4
–
0
Bit 5
GT0
–
–
–
0
1
0
1
0
R
R
3
0
3
–
0
Value
0x80
Bit 4
–
–
–
Guard Time (Number of IDLE bits)
+128 (default value)
+64
+32
+16
+8
GT2
R/W
R
2
0
2
0
Bit 3
–
–
–
GT1
R/W
R
1
0
1
0
Bit 2
GT2
–
–
GT0
R/W
R
0
0
0
0
NVMEN
ATtiny20
Bit 1
GT1
TPIPCR
TPIIR
–
Bit 0
GT0
–
–
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