ATtiny25 Automotive Atmel Corporation, ATtiny25 Automotive Datasheet - Page 85

• 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

14.1.2
7598H–AVR–07/09
General Timer/Counter1 Control Register - GTCCR
Table 14-2.
The Stop condition provides a Timer Enable/Disable function.
• Bit 6- PWM1B: Pulse Width Modulator B Enable
When set (one) this bit enables PWM mode based on comparator OCR1B in Timer/Counter1
and the counter value is reset to $00 in the CPU clock cycle after a compare match with OCR1C
register value.
• Bits 5,4 - COM1B1, COM1B0: Comparator B Output Mode, Bits 1 and 0
The COM1B1 and COM1B0 control bits determine any output pin action following a compare
match with compare register B in Timer/Counter1. Output pin actions affect pin PB3 (OC1B).
Since this is an alternative function to an I/O port, the corresponding direction control bit must be
set (one) in order to control an output pin. Note that OC1B is not connected in normal mode.
Table 14-3.
In PWM mode, these bits have different functions. Refer to
description.
Bit
$2C ($4C)
Read/Write
Initial value
COM1B1
CS13
0
0
1
1
0
1
1
1
1
1
1
1
1
Timer/Counter1 Prescale Select (Continued)
TSM
Comparator B Mode Select
R/W
COM1B0
7
0
0
1
0
1
CS12
1
0
0
0
0
1
1
1
1
PWM1B
R/W
6
0
Description
Timer/Counter Comparator B disconnected from output pin OC1B.
Toggle the OC1B output line.
Clear the OC1B output line.
Set the OC1B output line
COM1B1
CS11
R/W
1
0
0
1
1
0
0
1
1
5
0
COM1B0
R/W
4
0
CS10
1
0
1
0
1
0
1
0
1
FOC1B
W
3
0
Asynchronous
Clocking Mode
PCK/64
PCK/128
PCK/256
PCK/512
PCK/1024
PCK/2048
PCK/4096
PCK/8192
PCK/16384
Table 14-4 on page 90
FOC1A
W
2
0
ATtiny25/45/85
PSR1
R/W
1
0
Synchronous
Clocking Mode
CK/64
CK/128
CK/256
CK/512
CK/1024
CK/2048
CK/4096
CK/8192
CK/16384
PSR0
R/W
0
0
for a detailed
GTCCR
85