at90pwm81-16se ATMEL Corporation, at90pwm81-16se Datasheet - Page 174

• Manufacturer Part Number: at90pwm81-16se
• Description: 8-bit Avr Microcontroller With 8k Bytes In- System Programmable Flash
• Manufacturer: ATMEL Corporation

14.23.7
174
AT90PWM81
PSCR Control Register – PCTL0
Select the mode of PSC.
Table 14-11.
• Bit 2 – POP0: PSCR Output Polarity
If this bit is cleared, the PSCR outputs are active Low.
If this bit is set, the PSCR outputs are active High.
• Bit 1 – PCLKSEL0: PSCR Input Clock Select
This bit is used to select between CLKPF or CLKPS clocks.
Set this bit to select the fast clock input (CLKPF).
Clear this bit to select the slow clock input (CLKPS).
• Bit 0 – Reserved
• Bit 7:6 – PPRE01:0 : PSCR Prescaler Select
This two bits select the PSCR input clock division factor. All generated waveform will be modified by this
factor.
Table 14-12.
Bit
Read/Write
Initial Value
PMODE01
0
0
1
1
PPRE01
0
0
1
1
7
PPRE01
R/W
0
PSCR Mode Selection
PSCR Prescaler Selection
PPRE00
0
1
0
1
PMODE00
0
1
0
1
6
PPRE00
R/W
0
Description
No divider on PSCR input clock
Divide the PSCR input clock by 4
Divide the PSCR input clock by 32
Divide the PSCR clock by 256
5
PBFM01
R/W
0
Description
One Ramp Mode
Two Ramp Mode
Four Ramp Mode
Reserved
4
PAOC0B
R/W
0
3
PAOC0A
R/W
0
2
PBFM00
R/W
0
PCCYC0
1
R/W
0
0
PRUN0
R/W
0
7734M–AVR–03/10
PCTL0