Microchip Technology DM183021 Data Sheet
PIC18F2331/2431/4331/4431
DS39616D-page 178
2010 Microchip Technology Inc.
REGISTER 18-1:
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
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
PTOPS<3:0>:
PWM Time Base Output Postscale Select bits
0000
= 1:1 Postscale
0001
= 1:2 Postscale
.
.
.
1111
.
.
1111
= 1:16 Postscale
bit 3-2
PTCKPS<1:0>:
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
PTMOD<1:0>:
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 18-2:
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
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’