at94k40al ATMEL Corporation, at94k40al Datasheet - Page 108

• Manufacturer Part Number: at94k40al
• Description: At94kal Series Field Programmable System Level Integrated Circuit
• Manufacturer: ATMEL Corporation

108
AT94KAL Series FPSLIC
Table 4-20.
Table 4-21.
Notes:
In the PWM mode, the 8, 9 or 10 least significant OCR1A/OCR1B bits (depends of resolution),
when written, are transferred to a temporary location. They are latched when Timer/Counter1
reaches the value TOP. This prevents the occurrence of odd-length PWM pulses (glitches) in
the event of an unsynchronized OCR1A/OCR1B write. See
example in each mode.
OTC1
CTC1
x
0
0
0
1
1
1
0
0
1
1
(2)
(1)
1. X = A or B
2. x = Don’t care
PWM11
COM1X1
Timer TOP Values and PWM Frequency
Compare1 Mode Select in PWM Mode
0
1
1
0
1
1
0
1
1
1
1
(1)
PWM10
1
0
1
1
0
1
COM1X0
x
0
1
0
1
(2)
PWM Resolution
(1)
10-bit
10-bit
8-bit
9-bit
8-bit
9-bit
Effect on OCX1
Not connected
Cleared on compare match, up-counting. Set on
compare match, down-counting (non-inverted PWM)
Cleared on compare match, down-counting. Set on
compare match, up-counting (inverted PWM)
Cleared on Compare Match, Set on overflow
Set on Compare Match, cleared on overflow
Timer TOP Value
$03FF(1023)
$03FF(1023)
$00FF (255)
$01FF (511)
$00FF (255)
$01FF (511)
Figure 4-33
and
Figure 4-34
Frequency
f
f
f
f
TCK1
TCK1
f
f
TCK1
TCK1
TCK1
TCK1
1138I–FPSLI–1/08
/1022
/2046
/1024
/510
/256
/512
for an