ATtiny48 Atmel Corporation, ATtiny48 Datasheet - Page 111

• Manufacturer Part Number: ATtiny48
• Manufacturer: Atmel Corporation

Specifications of ATtiny48

• Flash (kbytes): 4 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 28
• Ext Interrupts: 28
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• 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
• Eeprom (bytes): 64
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• 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

Table 12-5.
8008H–AVR–04/11
Mode
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
WGM
13
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
Waveform Generation Mode Bit Description
WGM
12
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
Table 12-4
correct or the phase and frequency correct, PWM mode.
Table 12-4.
Note:
• Bits 3:2 – Res: Reserved Bits
These bits are reserved and will always read zero.
• Bits 1:0 – WGM1[1:0]: Waveform Generation Mode
Combined with the WGM1[3:2] bits found in the TCCR1B Register, these bits control the count-
ing sequence of the counter, the source for maximum (TOP) counter value, and what type of
waveform generation to be used, see
COM1A1
COM1B1
WGM
11
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
1. A special case occurs when OCR1A/OCR1B equals TOP and COM1A1/COM1B1 is set.
shows the COM1x[1:0] bit functionality when the WGM1[3:0] bits are set to the phase
“Phase Correct PWM Mode” on page 103.
WGM
10
COM1A0
COM1B0
Compare Output Mode, Phase Correct and Phase & Frequency Correct PWM
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Timer/Counter
Mode of Operation
Normal
PWM, Phase Correct, 8-bit
PWM, Phase Correct, 9-bit
PWM, Phase Correct, 10-bit
CTC
Fast PWM, 8-bit
Fast PWM, 9-bit
Fast PWM, 10-bit
PWM, Phase & Frequency Correct
PWM, Phase & Frequency Correct
PWM, Phase Correct
PWM, Phase Correct
CTC
(Reserved)
Fast PWM
Fast PWM
Description
Normal port operation, OC1A/OC1B disconnected.
WGM1[3:0] = 8, 9, 10 or 11: Toggle OC1A on Compare Match, OC1B
disconnected (normal port operation). For all other WGM1 settings, normal
port operation, OC1A/OC1B disconnected.
Clear OC1A/OC1B on Compare Match when up-counting. Set OC1A/OC1B
on Compare Match when downcounting.
Set OC1A/OC1B on Compare Match when up-counting. Clear OC1A/OC1B
on Compare Match when downcounting.
Table
12-5.
for more details.
TOP
0xFFFF
0x00FF
0x01FF
0x03FF
OCR1A
0x00FF
0x01FF
0x03FF
ICR1
OCR1A
ICR1
OCR1A
ICR1
–
ICR1
OCR1A
Update of
OCR1
Immediate
TOP
TOP
TOP
Immediate
TOP
TOP
TOP
BOTTOM
BOTTOM
TOP
TOP
Immediate
–
TOP
TOP
ATtiny48/88
x
at
BOTTOM
TOV1 Flag
Set on
MAX
BOTTOM
BOTTOM
BOTTOM
MAX
TOP
TOP
TOP
BOTTOM
BOTTOM
BOTTOM
MAX
–
TOP
TOP
See
111
(1)