ATA6613 ATMEL Corporation, ATA6613 Datasheet - Page 128

• Manufacturer Part Number: ATA6613
• Description: Ata6613
• Manufacturer: ATMEL Corporation

6.12.8.2
128
ATA6612/ATA6613
Timer/Counter Control Register B – TCCR0B
• Bit 7 – FOC0A: Force Output Compare A
• Bit 6 – FOC0B: Force Output Compare B
• Bits 5:4 – Res: Reserved Bits
• Bit 3 – WGM02: Waveform Generation Mode
• Bits 2:0 – CS02:0: Clock Select
Initial Value
Read/Write
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 COM0A1:0 bits setting. Note that the FOC0A bit is imple-
mented as a strobe. Therefore it is the value present in the COM0A1:0 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 is always read as zero.
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 COM0B1:0 bits setting. Note that the FOC0B bit is imple-
mented as a strobe. Therefore it is the value present in the COM0B1:0 bits that determines
the effect of the forced compare.
A FOC0B strobe will not generate any interrupt, nor will it clear the timer in CTC mode using
OCR0B as TOP.
The FOC0B bit is always read as zero.
These bits are reserved bits in the ATA6612/ATA6613 and will always read as zero.
See the description in the
The three Clock Select bits select the clock source to be used by the Timer/Counter.
Bit
FOC0A
W
7
0
FOC0B
W
6
0
“Timer/Counter Control Register A – TCCR0A” on page
R
5
–
0
R
–
0
4
WGM02
R
3
0
CS02
R
2
0
CS01
R/W
1
0
CS00
R/W
0
0
9111C–AUTO–02/08
125.
TCCR0B