PIC18F23K20-ESLASHML datasheet(181/420 Pages) MICROCHIP

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Advance Information

DS41303B-page 179

PIC18F2XK20/4XK20

16.4.7

PULSE STEERING MODE

In Single Output mode, pulse steering allows any of the

PWM pins to be the modulated signal. Additionally, the

same PWM signal can be simultaneously available on

multiple pins.

Once

the

Single

Output

mode

selected

(CCP1M<3:2> = 11

and

P1M<1:0> = 00

the

CCP1CON register), the user firmware can bring out

the same PWM signal to one, two, three or four output

pins by setting the appropriate STR<D:A> bits of the

PSTRCON register, as shown in Table 16-1.

While the PWM Steering mode is active, CCP1M<1:0>

bits of the CCP1CON register select the PWM output

polarity for the P1<D:A> pins.

The PWM auto-shutdown operation also applies to

PWM Steering mode as described in Section 16.4.4

“Enhanced

PWM

Auto-shutdown

mode”.

auto-shutdown event will only affect pins that have

PWM outputs enabled.

Note:

The associated TRIS bits must be set to

output (‘0’) to enable the pin output driver

in order to see the PWM signal on the pin.

PSTRCON: PULSE STEERING CONTROL REGISTER(1)

U-0

R/W-0

R/W-1

—

STRSYNC

STRD

STRC

STRB

STRA

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-5

Unimplemented: Read as ‘0’

bit 4

STRSYNC: Steering Sync bit

= Output steering update occurs on next PWM period

= Output steering update occurs at the beginning of the instruction cycle boundary

bit 3

STRD: Steering Enable bit D

= P1D pin has the PWM waveform with polarity control from CCPxM<1:0>

= P1D pin is assigned to port pin

bit 2

STRC: Steering Enable bit C

= P1C pin has the PWM waveform with polarity control from CCPxM<1:0>

= P1C pin is assigned to port pin

bit 1

STRB: Steering Enable bit B

= P1B pin has the PWM waveform with polarity control from CCPxM<1:0>

0 = P1B pin is assigned to port pin

bit 0

STRA: Steering Enable bit A

= P1A pin has the PWM waveform with polarity control from CCPxM<1:0>

= P1A pin is assigned to port pin

Note 1:

The PWM Steering mode is available only when the CCP1CON register bits CCP1M<3:2> = 11 and

P1M<1:0> = 00.

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