Freescale-semiconductor ColdFire MCF52210 Manual de usuario descargar pdf (Pagina 482)

100

101

Pulse-Width Modulation (PWM) Module

MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2

27-8 Freescale Semiconductor

27.2.7 PWM Scale A Register (PWMSCLA)

PWMSCLA is the programmable scale value used in scaling clock A to generate clock SA. Clock SA is

generated with the following equation:

Eqn. 27-1

Any value written to this register causes the scale counter to load the new scale value (PWMSCLA).

PSWAI

PWM stops in doze mode. Disables the input clock to the prescaler while in doze mode.

0 Allow the clock to the prescaler while in doze mode

1 Stop the input clock to the prescaler when the core is in doze mode

PFRZ

PWM counters stop in debug mode (BKPT

asserted).

0 Allow PWM counters to continue while in debug mode

1 Disable PWM input clock to the prescaler when the core is in debug mode. Useful for emulation as it allows the

PWM function to be suspended.

1–0 Reserved, should be cleared.

IPSBAR

Offset:

0x1B_0008 (PWMSCLA) Access: User Read/Write

76543210

SCALEA

Reset:00000000

Figure 27-8. PWM Scale A Register (PWMSCLA)

Table 27-8. PWMSCLA Field Descriptions

Field Description

7–0

SCALEA

Part of divisor used to form Clock SA from Clock A.

Table 27-7. PWMCTL Field Descriptions (continued)

Field Description

Clock SA

Clock A

2PWMSCLA×

-----------------------------------------

SCALEA Value

0x00 256

0x01 1

0x02 2

... ...

0xFF 255

1 2 ... 477 478 479 480 481 482 483 484 485 486 487 ... 575 576

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Freescale-semiconductor ColdFire MCF52210 Manual de usuario Pagina 482

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