AT94K10AL-25BQC Atmel, AT94K10AL-25BQC Datasheet - Page 95

• Manufacturer Part Number: AT94K10AL-25BQC
• Manufacturer: Atmel

Specifications of AT94K10AL-25BQC

• Device System Gates: 10000
• Propagation Delay Time: 12.7ns
• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (max): 3.6V
• Operating Supply Voltage (min): 3V
• Operating Temperature Classification: Commercial
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Mounting: Surface Mount
• Pin Count: 144
• Package Type: LQFP
• Lead Free Status / RoHS Status: Not Compliant

4.25.1
4.25.2
1138I–FPSLI–1/08
Timer/Counter 0 and 2 in PWM Mode
PWM Modes (Up/Down and Overflow)
Both Timer/Counters are realized as up or up/down (in PWM mode) counters with read and write
access. If the Timer/Counter is written to and a clock source is selected, it continues counting in
the timer clock cycle following the write operation.
Timer/Counter0 Output Compare Register – OCR0
Timer/Counter2 Output Compare Register – OCR2
The output compare registers are 8-bit read/write registers. The Timer/Counter Output Compare
Registers contains the data to be continuously compared with the Timer/Counter. Actions on
compare matches are specified in TCCR0 and TCCR2. A compare match does only occur if the
Timer/Counter counts to the OCR value. A software write that sets Timer/Counter and Output
Compare Register to the same value does not generate a compare match.
A compare match will set the compare interrupt flag in the CPU clock-cycle following the com-
pare event.
When PWM mode is selected, the Timer/Counter either wraps (overflows) when it reaches $FF
or it acts as an up/down counter.
If the up/down mode is selected, the Timer/Counter and the Output Compare Registers – OCR0
or OCR2 form an 8-bit, free-running, glitch-free and phase correct PWM with outputs on the
PE1(OC0/PWM0) or PE3(OC2/PWM2) pin.
If the overflow mode is selected, the Timer/Counter and the Output Compare Registers – OCR0
or OCR2 form an 8-bit, free-running and glitch-free PWM, operating with twice the speed of the
up/down counting mode.
The two different PWM modes are selected by the CTC0 or CTC2 bit in the Timer/Counter Con-
trol Registers – TCCR0 or TCCR2 respectively.
If CTC0/CTC2 is cleared and PWM mode is selected, the Timer/Counter acts as an up/down
counter, counting up from $00 to $FF, where it turns and counts down again to zero before the
cycle is repeated. When the counter value matches the contents of the Output Compare Regis-
ter, the PE1(OC0/PWM0) or PE3(OC2/PWM2) pin is set or cleared according to the settings of
the COMn1/COMn0 bits in the Timer/Counter Control Registers TCCR0 or TCCR2.
If CTC0/CTC2 is set and PWM mode is selected, the Timer/Counters will wrap and start count-
ing from $00 after reaching $FF. The PE1(OC0/PWM0) or PE3(OC2/PWM2) pin will be set or
cleared according to the settings of COMn1/COMn0 on a Timer/Counter overflow or when the
counter value matches the contents of the Output Compare Register. Refer to
details.
Bit
$31 ($51)
Read/Write
Initial Value
Bit
$22 ($42)
Read/Write
Initial Value
7
MSB
R/W
0
7
MSB
R/W
0
6
R/W
0
6
R/W
0
5
0
5
0
R/W
R/W
4
R/W
0
4
R/W
0
AT94KAL Series FPSLIC
3
R/W
0
3
R/W
0
2
R/W
0
2
R/W
0
1
R/W
0
1
R/W
0
0
LSB
R/W
0
0
LSB
R/W
0
Table 4-15
OCR0
OCR2
for
95