PIC16C717/770/771
In Full-Bridge output mode, four pins are used as out-
puts; however, only two outputs are active at a time. In
the Forward mode, RB3/CCP1/P1A pin is continuously
active, and RB7/T1OSI/P1D pin is modulated. In the
Reverse mode, RB6/T1OSO/T1CKI/P1C pin is contin-
uously active, and RB5/SDO/P1B pin is modulated.
P1A, P1B, P1C and P1D outputs are multiplexed with
PORTB<3> and PORTB<5:7> data latches. TRISB<3>
and TRISB<5:7> bits must be cleared to make the P1A,
P1B, P1C, and P1D pins output.
FIGURE 8-8:
FULL-BRIDGE PWM OUTPUT
FORWARD MODE
Period
P1A
(2)
1
0
Duty Cycle
P1B
(2)
1
0
P1C
(2)
1
0
P1D
(2)
1
0
(1)
(1)
REVERSE MODE
Period
Duty Cycle
P1A
(2)
1
0
P1B
(2)
1
0
P1C
(2)
1
0
1
0
(1)
(1)
P1D
(2)
Note 1:
At this time, the TMR2 register is equal to the PR2 register.
2:
Output signal is shown as asserted high.
DS41120A-page 62
Advanced Information
漏
1999 Microchip Technology Inc.