ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 94

• Manufacturer Part Number: ATtiny25 Automotive
• Manufacturer: Atmel Corporation

Specifications of ATtiny25 Automotive

• Flash (kbytes): 2 Kbytes
• Pin Count: 8
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 4
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 6
• Ext Interrupts: 6
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• Eeprom (bytes): 128
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 5
• Pwm Channels: 6
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

15.1
94
Timer/Counter1 Dead Time Prescaler register 1 - DTPS1
ATtiny25/45/85
The length of the counting period is user adjustable by selecting the dead time prescaler setting
in 0x23 register, and selecting then the dead time value in I/O register DT1x. The DT1x register
consists of two 4-bit fields, DT1xH and DT1xL that control the dead time periods of the PWM
output and its’ complementary output separately. Thus the rising edge of OC1x and OC1x can
have different dead time periods. The dead time is adjusted as the number of prescaled dead
time generator clock cycles.
Figure 15-3. The Complementary Output Pair
The dead time prescaler register, DTPS1 is a 2-bit read/write register.
Bits 1 - 0 - DTPS1: Timer/Counter1 Dead Time Prescaler register 1
The dedicated Dead Time prescaler in front of the Dead Time Generator can divide the
Timer/Counter1 clock (PCK or CK) by 1, 2, 4 or 8 providing a large range of dead times that can
be generated. The Dead Time prescaler is controlled by two bits DTPS11..10 from the Dead
Time Prescaler register. These bits define the division factor of the Dead Time prescaler. The
division factors are given in table 46..
Table 15-1.
Bit
$23 ($43)
Read/Write
Initial value
DTPS11
PWM1x
OC1x
OC1x
x = A or B
0
0
1
1
t
non-overlap / rising edge
Division factors of the Dead Time prescaler
R
7
0
DTPS10
0
1
0
1
R
6
0
Prescaler divides the T/C1 clock by
1x (no division)
2x
4x
8x
t
non-overlap / falling edge
5
R
0
R
4
0
R
3
0
R
2
0
DTPS11
R/W
1
0
DTPS10
R/W
0
0
7598H–AVR–07/09
DTPS1