ATtiny40 Atmel Corporation, ATtiny40 Datasheet - Page 154

• Manufacturer Part Number: ATtiny40
• Manufacturer: Atmel Corporation

Specifications of ATtiny40

• Flash (kbytes): 4 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 18
• Ext Interrupts: 18
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

19.7.1
19.7.2
154
ATtiny40
TPIIR – Tiny Programming Interface Identification Register
TPIPCR – Tiny Programming Interface Physical Layer Control Register
Table 19-11. Summary of Control and Status Registers
• 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 19-12. 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 19-13. 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 19-13
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
–
–
–
19-12.
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
Bit 1
GT1
TPIPCR
TPIIR
–
8263A–AVR–08/10
Bit 0
GT0
–
–