PC312XDP512F0CFVR datasheet(375/1348 Pages) FREESCALE

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Chapter 8 Pulse-Width Modulator (S12PWM8B8CV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

Freescale Semiconductor

375

Read: Always read $00 in normal modes

Write: Unimplemented in normal modes

NOTE

Writing to this register when in special modes can alter the PWM

functionality.

8.3.2.8

Reserved Register (PWMPRSC)

This register is reserved for factory testing of the PWM module and is not available in normal modes.

Read: Always read $00 in normal modes

Write: Unimplemented in normal modes

NOTE

Writing to this register when in special modes can alter the PWM

functionality.

8.3.2.9

PWM Scale A Register (PWMSCLA)

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

generated by taking clock A, dividing it by the value in the PWMSCLA register and dividing that by two.

Clock SA = Clock A / (2 * PWMSCLA)

NOTE

When PWMSCLA = $00, PWMSCLA value is considered a full scale value

of 256. Clock A is thus divided by 512.

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

76543210

00000000

Reset

00000000

= Unimplemented or Reserved

Figure 8-9. Reserved Register (PWMTST)

76543210

00000000

Reset

00000000

= Unimplemented or Reserved

Figure 8-10. Reserved Register (PWMPRSC)

PC312XDP512F0CFVR Datasheet(PDF) 375 Page - Freescale Semiconductor, Inc