ATtiny40 Atmel Corporation, ATtiny40 Datasheet - Page 164

• 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

20.7
20.7.1
20.7.2
164
Register Description
ATtiny40
NVMCMD – Non-Volatile Memory Command Register
NVMCSR – Non-Volatile Memory Control and Status Register
See NVMEN bit in
• Bits 7:6 – Res: Reserved Bits
These bits are reserved and will always read as zero.
• Bits 5:0 – NVMCMD[5:0]: Non-Volatile Memory Command
These bits define the programming commands for the flash, as shown in
Table 20-9.
• Bit 7 – NVMBSY: Non-Volatile Memory Busy
This bit indicates the NVM memory (Flash memory and Lock Bits) is busy, being programmed.
This bit is set when a program operation is started, and it remains set until the operation has
been completed.
• Bits 6:0 – Res: Reserved Bits
These bits are reserved and will always read as zero.
Bit
0x33
Read/Write
Initial Value
Bit
0x32
Read/Write
Initial Value
Operation Type
General
Section
Flash Words
NVMBSY
NVM Programming commands
R/W
R
7
–
0
7
0
“TPISR – Tiny Programming Interface Status Register” on page
0b000000
0b010000
0b010100
R
0b011101
6
–
0
Binary
R
6
–
0
NVMCMD
R/W
5
0
R
5
–
0
0x1D
0x00
0x10
0x14
Hex
R/W
4
0
R
4
–
0
R/W
Mnemonic
NO_OPERATION
CHIP_ERASE
SECTION_ERASE
CODE_WRITE
NVMCMD[5:0]
3
0
R
3
–
0
R/W
2
0
R
2
–
0
R/W
1
0
R
1
–
0
Description
No operation
Chip erase
Section erase
Write Flash words
R/W
Table
0
0
R
0
–
0
NVMCMD
20-9.
NVMCSR
8263A–AVR–08/10
155.