PC912XDP512F0CALR datasheet(376/1348 Pages) FREESCALE

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Chapter 8 Pulse-Width Modulator (S12PWM8B8CV1)

MC9S12XDP512 Data Sheet, Rev. 2.21

376

Freescale Semiconductor

Read: Anytime

Write: Anytime (causes the scale counter to load the PWMSCLA value)

8.3.2.10

PWM Scale B Register (PWMSCLB)

PWMSCLB is the programmable scale value used in scaling clock B to generate clock SB. Clock SB is

generated by taking clock B, dividing it by the value in the PWMSCLB register and dividing that by two.

Clock SB = Clock B / (2 * PWMSCLB)

NOTE

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

of 256. Clock B is thus divided by 512.

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

Read: Anytime

Write: Anytime (causes the scale counter to load the PWMSCLB value).

8.3.2.11

Reserved Registers (PWMSCNTx)

The registers PWMSCNTA and PWMSCNTB are reserved for factory testing of the PWM module and are

not available in normal modes.

Read: Always read $00 in normal modes

Write: Unimplemented in normal modes

76543210

Bit 7

Bit 0

Reset

00000000

Figure 8-11. PWM Scale A Register (PWMSCLA)

76543210

Bit 7

Bit 0

Reset

00000000

Figure 8-12. PWM Scale B Register (PWMSCLB)

76543210

00000000

Reset

00000000

= Unimplemented or Reserved

Figure 8-13. Reserved Registers (PWMSCNTx)

PC912XDP512F0CALR Datasheet(PDF) 376 Page - Freescale Semiconductor, Inc