PIC12F617T-EMD View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

PIC12F617T-EMD

8-Pin Flash-Based, 8-Bit CMOS Microcontrollers

Microchip Technology 

PIC12F609/615/617/12HV609/615

11.4 PWM (Enhanced Mode)

The Enhanced PWM Mode can generate a PWM signal

on up to four different output pins with up to 10-bits of

resolution. It can do this through four different PWM

output modes:

• Single PWM

• Half-Bridge PWM

To select an Enhanced PWM mode, the P1M bits of the

CCP1CON register must be set appropriately.

The PWM outputs are multiplexed with I/O pins and are

designated P1A and P1B. The polarity of the PWM pins

is configurable and is selected by setting the CCP1M

bits in the CCP1CON register appropriately.

Table 11-6 shows the pin assignments for each

Enhanced PWM mode.

Figure 11-5 shows an example of a simplified block

diagram of the Enhanced PWM module.

Note:

To prevent the generation of an

incomplete waveform when the PWM is

first enabled, the ECCP module waits until

the start of a new PWM period before

generating a PWM signal.

FIGURE 11-5:

EXAMPLE SIMPLIFIED BLOCK DIAGRAM OF THE ENHANCED PWM MODE

Duty Cycle Registers

CCPR1L

CCP1<1:0>

CCPR1H (Slave)

Comparator

R

TMR2

(1)

S

Comparator

PR2

Clear Timer2,

toggle PWM pin and

latch duty cycle

P1M<1:0>

CCP1M<3:0>

2

4

(APFCON<0>)

P1ASEL

CCP1/P1A

0

TRISIO2

1

Q

Output

TRISIO5

Controller

(APFCON<1>)

P1BSEL

0

P1B

TRISIO0

1

TRISIO4

PWM1CON

CCP1/P1A

CCP1/P1A*

P1B

P1B*

* Alternate pin function.

Note 1: The 8-bit timer TMR2 register is concatenated with the 2-bit internal Q clock, or 2 bits of the prescaler to create the 10-bit time base.

Note 1: The TRIS register value for each PWM output must be configured appropriately.

2: Clearing the CCP1CON register will relinquish ECCP control of all PWM output pins.

3: Any pin not used by an Enhanced PWM mode is available for alternate pin functions.

TABLE 11-6:

ECCP Mode

Single

Half-Bridge

EXAMPLE PIN ASSIGNMENTS FOR VARIOUS PWM ENHANCED MODES

P1M<1:0>

CCP1/P1A

P1B

00

Yes(1)

Yes(1)

10

Yes

Yes

 2010 Microchip Technology Inc.

DS41302D-page 97

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