ATTINY20-EK1 Atmel, ATTINY20-EK1 Datasheet - Page 74

• Manufacturer Part Number: ATTINY20-EK1
• Description: KIT EVAL TOUCH ATTINY20
• Manufacturer: Atmel

Specifications of ATTINY20-EK1

• Sensor Type: *
• Sensing Range: *
• Interface: *
• Sensitivity: *
• Voltage - Supply: *
• Embedded: *
• Utilized Ic / Part: *
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: TinyAVR
• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Mcu Supported Families: ATtiny20
• Tool / Board Applications: Microcontroller
• Rohs Compliant: Yes
• Tool Type: Development Kit
• Cpu Core: AVR 8
• Data Bus Width: 8 bit
• Processor To Be Evaluated: ATtiny20
• Interface Type: Touch
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.9.2
74
ATtiny20
TCCR0B – Timer/Counter Control Register B
Table 11-8.
Note:
• Bit 7 – FOC0A: Force Output Compare A
The FOC0A bit is only active when the WGM bits specify a non-PWM mode.
However, for ensuring compatibility with future devices, this bit must be set to zero when
TCCR0B is written when operating in PWM mode. When writing a logical one to the FOC0A bit,
an immediate Compare Match is forced on the Waveform Generation unit. The OC0A output is
changed according to its COM0A[1:0] bits setting. Note that the FOC0A bit is implemented as a
strobe. Therefore it is the value present in the COM0A[1:0] bits that determines the effect of the
forced compare.
A FOC0A strobe will not generate any interrupt, nor will it clear the timer in CTC mode using
OCR0A as TOP.
The FOC0A bit always reads as zero.
• Bit 6 – FOC0B: Force Output Compare B
The FOC0B bit is only active when the WGM bits specify a non-PWM mode.
However, for ensuring compatibility with future devices, this bit must be set to zero when
TCCR0B is written when operating in PWM mode. When writing a logical one to the FOC0B bit,
an immediate Compare Match is forced on the Waveform Generation unit. The OC0B output is
changed according to its COM0B[1:0] bits setting. Note that the FOC0B bit is implemented as a
strobe. Therefore it is the value present in the COM0B[1:0] bits that determines the effect of the
forced compare.
Bit
0x18
Read/Write
Initial Value
Mode
0
1
2
3
4
5
6
7
1. MAX
BOTTOM = 0x00
WGM02
Waveform Generation Mode Bit Description
0
0
0
0
1
1
1
1
FOC0A
W
7
0
= 0xFF
WGM01
FOC0B
0
0
1
1
0
0
1
1
W
6
0
WGM00
0
1
0
1
0
1
0
1
R
5
0
–
Timer/Counter
Mode of Operation
Normal
PWM, Phase
Correct
CTC
Fast PWM
Reserved
PWM, Phase
Correct
Reserved
Fast PWM
R
4
–
0
WGM02
R/W
3
0
CS02
R/W
2
0
OCRA
OCRA
OCRA
0xFF
0xFF
0xFF
TOP
–
–
CS01
R/W
1
0
Update of
Immediate
Immediate
BOTTOM
BOTTOM
OCRx at
TOP
TOP
–
–
CS00
R/W
0
0
8235B–AVR–04/11
TOV Flag
BOTTOM
BOTTOM
Set on
TCCR0B
MAX
MAX
MAX
TOP
–
–
(1)