Datasheet

PIC18F1230/1330
DS39758D-page 122  2009 Microchip Technology Inc.
REGISTER 14-1: PTCON0: PWM TIMER CONTROL REGISTER 0
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
PTOPS3 PTOPS2 PTOPS1 PTOPS0 PTCKPS1 PTCKPS0 PTMOD1 PTMOD0
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 7-4 PTOPS3:PTOPS0: PWM Time Base Output Postscale Select bits
0000 = 1:1 Postscale
0001 = 1:2 Postscale
.
.
.
1111 = 1:16 Postscale
bit 3-2 PTCKPS1:PTCKPS0: PWM Time Base Input Clock Prescale Select bits
00 = PWM time base input clock is F
OSC/4 (1:1 prescale)
01 = PWM time base input clock is F
OSC/16 (1:4 prescale)
10 = PWM time base input clock is F
OSC/64 (1:16 prescale)
11 = PWM time base input clock is F
OSC/256 (1:64 prescale)
bit 1-0 PTMOD1:PTMOD0: PWM Time Base Mode Select bits
11 = PWM time base operates in a Continuous Up/Down Count mode with interrupts for double PWM
updates
10 = PWM time base operates in a Continuous Up/Down Count mode
01 = PWM time base configured for Single-Shot mode
00 = PWM time base operates in a Free-Running mode
REGISTER 14-2: PTCON1: PWM TIMER CONTROL REGISTER 1
R/W-0 R-0 U-0 U-0 U-0 U-0 U-0 U-0
PTEN PTDIR — — — — — —
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 PTEN: PWM Time Base Timer Enable bit
1 = PWM time base is on
0 = PWM time base is off
bit 6 PTDIR: PWM Time Base Count Direction Status bit
1 = PWM time base counts down
0 = PWM time base counts up
bit 5-0 Unimplemented: Read as ‘0’