PIC12F1822-ISLASHMF datasheet(218/398 Pages) MICROCHIP

218 / 398 page

PIC12F/LF1822/16F/LF1823

DS41413A-page 218

Preliminary

 2010 Microchip Technology Inc.

23.4.6

PWM STEERING MODE

In Single Output mode, PWM 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 of 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 STR1 bits of the

PSTR1CON register, as shown in Table 23-8.

While the PWM Steering mode is active, the

CCP1M<1:0> bits of the CCP1CON register determine

the polarity of the output pins.

The PWM auto-shutdown operation also applies to

PWM Steering mode as described in Section 23.4.3

“Enhanced PWM Auto-shutdown mode”. An auto-

shutdown event will only affect pins that have PWM

outputs enabled.

FIGURE 23-18:

SIMPLIFIED STEERING

BLOCK DIAGRAM

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.

TRIS

P1A pin

PORT Data

P1A Signal

STR1A

TRIS

P1B pin

PORT Data

STR1B

TRIS

P1C pin(3)

PORT Data

STR1C

TRIS

P1D pin(3)

PORT Data

STR1D

Note 1: Port outputs are configured as shown when

the CCP1CON register bits P1M<1:0> = 00

and CCP1M<3:2> = 11.

2: Single PWM output requires setting at least

one of the STR1 bits.

3: PIC16F/LF1823 only.

CCP1M1

CCP1M0

CCP1M1

CCP1M0

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