at91sam9263 ATMEL Corporation, at91sam9263 Datasheet - Page 715

• Manufacturer Part Number: at91sam9263
• Description: At91 Arm Thumb Microcontrollers
• Manufacturer: ATMEL Corporation

38.5.1
Figure 38-2. Functional View of the Clock Generator Block Diagram
6249D–ATARM–20-Dec-07
PWM Clock Generator
Caution: Before using the PWM macrocell, the programmer must first enable the PWM clock in
the Power Management Controller (PMC).
The PWM macrocell master clock, MCK, is divided in the clock generator module to provide dif-
ferent clocks available for all channels. Each channel can independently select one of the
divided clocks.
The clock generator is divided in three blocks:
Each linear divider can independently divide one of the clocks of the modulo n counter. The
selection of the clock to be divided is made according to the PREA (PREB) field of the PWM
Mode register (PWM_MR). The resulting clock clkA (clkB) is the clock selected divided by DIVA
(DIVB) field value in the PWM Mode register (PWM_MR).
– a modulo n counter which provides 11 clocks: F
– two linear dividers (1, 1/2, 1/3, ... 1/255) that provide two separate clocks: clkA and
F
clkB
MCK
/16, F
MCK
MCK
modulo n counter
/32, F
MCK
/64, F
PREA
PREB
PWM_MR
PWM_MR
MCK
Divider A
Divider B
/128, F
DIVA
DIVB
AT91SAM9263 Preliminary
MCK
MCK/2
MCK/4
MCK/8
MCK/16
MCK/32
MCK/64
MCK/128
MCK/256
MCK/512
MCK/1024
MCK
/256, F
clkA
clkB
MCK
MCK
, F
MCK
/512, F
/2, F
MCK
MCK
/1024
/4, F
MCK
/8,
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