PIC18F25J50 MICROCHIP [Microchip Technology], PIC18F25J50 Datasheet - Page 261
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PIC18F25J50
Manufacturer Part Number
PIC18F25J50
Description
28/44-Pin, Low-Power, High-Performance USB Microcontrollers with nanoWatt XLP Technology
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
1.PIC18F25J50.pdf
(562 pages)
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18.5.4
The PWM mode supports an Auto-Shutdown mode that
will disable the PWM outputs when an external
shutdown event occurs. Auto-Shutdown mode places
the PWM output pins into a predetermined state. This
mode is used to help prevent the PWM from damaging
the application.
The auto-shutdown sources are selected using the
ECCPxAS<2:0> bits of the ECCPxAS register. A
shutdown event may be generated by:
• A logic ‘0’ on the pin that is assigned the FLT0
• Comparator C1
• Comparator C2
• Setting the ECCPxASE bit in firmware
REGISTER 18-2:
2011 Microchip Technology Inc.
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 7
bit 6-4
bit 3-2
bit 1-0
ECCPxASE
input function
Note 1: The auto-shutdown condition is a level-based signal, not an edge-based signal. As long as the level is
R/W-0
2: Writing to the ECCPxASE bit is disabled while an auto-shutdown condition persists.
3: Once the auto-shutdown condition has been removed and the PWM restarted (either through firmware or
ENHANCED PWM
AUTO-SHUTDOWN MODE
present, the auto-shutdown will persist.
auto-restart), the PWM signal will always restart at the beginning of the next PWM period.
ECCPxASE: ECCP Auto-Shutdown Event Status bit
1 = A shutdown event has occurred; ECCP outputs are in a shutdown state
0 = ECCP outputs are operating
ECCPxAS<2:0>: ECCP Auto-Shutdown Source Select bits
000 = Auto-shutdown is disabled
001 = Comparator C1OUT output is high
010 = Comparator C2OUT output is high
011 = Either Comparator C1OUT or C2OUT is high
100 = V
101 = V
110 = V
111 = V
PSSxAC<1:0>: Pins PxA and PxC Shutdown State Control bits
00 = Drive PxA and PxC pins to ‘0’
01 = Drive PxA and PxC pins to ‘1’
1x = PxA and PxC pins tri-state
PSSxBD<1:0>: Pins PxB and PxD Shutdown State Control bits
00 = Drive PxB and PxD pins to ‘0’
01 = Drive PxB and PxD pins to ‘1’
1x = PxB and PxD pins tri-state
ECCPxAS2
R/W-0
ECCPxAS: ECCPx AUTO-SHUTDOWN CONTROL REGISTER
(ACCESS FBEh, FB8h)
IL
IL
IL
IL
on FLT0 pin
on FLT0 pin or Comparator C1OUT output is high
on FLT0 pin or Comparator C2OUT output is high
on FLT0 pin or Comparator C1OUT or Comparator C2OUT is high
W = Writable bit
‘1’ = Bit is set
ECCPxAS1
R/W-0
ECCPxAS0
R/W-0
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
PSSxAC1
PIC18F46J50 FAMILY
R/W-0
A shutdown condition is indicated by the ECCPxASE
(Auto-Shutdown Event Status) bit of the ECCPxAS
register. If the bit is a ‘0’, the PWM pins are operating
normally. If the bit is a ‘1’, the PWM outputs are in the
shutdown state.
When a shutdown event occurs, two things happen:
The ECCPxASE bit is set to ‘1’. The ECCPxASE will
remain set until cleared in firmware or an auto-restart
occurs (see
The enabled PWM pins are asynchronously placed in
their shutdown states. The PWM output pins are
grouped into pairs, [PxA/PxC] and [PxB/PxD]. The state
of each pin pair is determined by the PSSxAC and
PSSxBD bits of the ECCPxAS register. Each pin pair
may be placed into one of three states:
• Drive logic ‘1’
• Drive logic ‘0’
• Tri-state (high-impedance)
Section 18.5.5 “Auto-Restart
PSSxAC0
R/W-0
x = Bit is unknown
PSSxBD1
R/W-0
DS39931D-page 261
PSSxBD0
Mode”).
R/W-0
bit 0
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