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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).
3
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
2
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
R
SCALEA
W
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