ST92185B datasheet(162/178 Pages) STMICROELECTRONICS

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ST92185B - PWM GENERATOR

PWM GENERATOR (Cont’d)

Up to 8 PWM outputs can be selected as Alternate

Functions of an I/O port. Each output bit is inde-

pendently controlled by a separate Compare Reg-

ister. When the value programmed into the Com-

pare Register and the counter value are equal, the

corresponding output bit is set. The output bit is re-

set by a counter clear (by overflow or autoclear),

generating the variable PWM signal.

Each output bit can also be complemented or dis-

abled under software control.

7.9.2 Register Mapping

The ST9 can have one or two PWM Generators.

Each has 13 registers mapped in page 59 (PWM0)

or page 58 (PWM1). In the register description on

the following pages, the register page refers to

PWM0 only.

Figure 103. PWM Action When Compare Register = 0 (no complement)

Figure 104. PWM Action When Compare Register = 3 (no complement)

Address

Function

R240

CM0

Ch. 0 Compare Register

R241

CM1

Ch. 1 Compare Register

R242

CM2

Ch. 2 Compare Register

R243

CM3

Ch. 3 Compare Register

R244

CM4

Ch. 4 Compare Register

R245

CM5

Ch. 5 Compare Register

R246

CM6

Ch. 6 Compare Register

R247

CM7

Ch. 7 Compare Register

R248

ACR

Autoclear Register

R249

CRR

Counter Read Register

R250

PCTLR

Prescaler/ Reload Reg.

R251

OCPLR

Output Complement Reg.

R252

OER

Output Enable Register

R253- R255

—

Reserved

VR0A1814

PWM

CLOCK

PWM

OUTPUT

Counter=Autoclear value

Counter=0

Counter=1

VR001814

PWM

CLOCK

PWM

OUTPUT

Counter=Autoclear value

Counter=0

Counter=3

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