Maxim-integrated DS4830 Optical Microcontroller Manual de usuario descargar pdf (Pagina 123)

DS4830 User’s Guide

123

14.3.2.2 – Local Register PWMCGFn

Bit

INV

ALT_

LOC

PWMEN

CLK_SEL

PS32

PS4

RES

Name

PWMDATA[15:0]

Reset

Access

PWMCN REG_SEL = 01b

PWMDATA[15:0]  PWMCFGn[15:0]

BIT

NAME

DESCRIPTION

INV

Invert PWM Output. When this bit is set to ‘1’, PWM output is inverted for the selected

PWM channel (determined by the PWM_SEL[3:0] bits).

Reserved. The user should write 0 to this bit.

ALT_LOC

Alternate Location: PWM outputs at channels 0 to 7 are multiplexed with the DAC

outputs. By default, the PWM outputs appear at the DAC outputs. When ALT_LOC bit is

set to ‘1’, the PWM outputs will appear at the alternate location (See Table 14-3 for

details).

PWMEN

Local Enable: Setting this bit to ‘1’ will enable the individual PWM channel. PWM

operation will be enabled only when both local enable and the Master Enable M_EN in

PWMCN are enabled. Setting this bit to ‘0’ will disable the individual PWM channel.

11:10

Reserved

Reserved. The user should not write to these bits.

9:8

CLK_SEL[1:0]

Clock Select. These bits selects the PWM clock for selected PWM channel (which is

selected by PWM_SEL[3:0] bits).

CLK_SEL

PWM Clock Source

00b

Core Clock

01b

Peripheral Clock

1xb

External Clock

The external clock range is 20MHz to 133MHz.

PS32

32-Slot Pulse Spreading: Setting this bit to ‘1’ enables 32-slot pulse spreading if PWM

resolution is 12 bits and PS4 bit is set to ‘1’. When this bit and PS4 are set to ‘1’, the PWM

period is divided into 32 slots of equal length. Setting this bit to ‘0’ disables the 32-slot

pulse spreading.

6:5

Reserved

Reserved. The user should not write to these bits.

PS4

4-Slot Pulse Spreading: Setting this bit to ‘1’ enables 4-slot pulse spreading. When this

bit is set to ‘1’, the PWM period is divided into 4 slots of equal length. When this bit is set

to ‘0’, it disables 4-slot and 32-slot pulse spreading.

Reserved

Reserved. The user should not write to this bit.

2:0

RES[2:0]

Resolution Select. These bits are used to configure PWM resolution (in bits) for selected

PWM channel (which is selected by PWM_SEL[3:0] bits). The PWM Frame frequency is

determined by the clock Frequency programmed and the resolution selected.

FrequencyClockPWM

FrequencyFramePWM



where n is the selected resolution.

RES[2:0]

PWM Resolution bits

000b

001b

010b

011b

100b

101b

110b

111b

1 2 ... 118 119 120 121 122 123 124 125 126 127 128 ... 226 227

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Maxim-integrated DS4830 Optical Microcontroller Manual de usuario Pagina 123

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