PIC16F1828-I/SS Microchip Technology, PIC16F1828-I/SS Datasheet - Page 232

• Manufacturer Part Number: PIC16F1828-I/SS
• Description: IC PIC MCU 8BIT 14KB FLSH 20SSOP
• Manufacturer: Microchip Technology
• Series: PIC® XLP™ 16Fr

Specifications of PIC16F1828-I/SS

• Core Size: 8-Bit
• Program Memory Size: 7KB (4K x 14)
• Core Processor: PIC
• Speed: 32MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 17
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-SSOP (0.200", 5.30mm Width)
• Controller Family/series: PIC16F
• No. Of I/o's: 18
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 256Byte
• Cpu Speed: 32MHz
• No. Of Timers: 5
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PIC16(L)F1824/1828
24.4.3
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
CCPxAS<2:0> bits of the CCPxAS register. A shutdown
event may be generated by:
• A logic ‘0’ on the INT pin
• A logic ‘1’ on a Comparator (Cx) output
A shutdown condition is indicated by the CCPxASE
(Auto-Shutdown Event Status) bit of the CCPxAS
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 CCPxASE bit is set to ‘1’. The CCPxASE 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 CCPxAS register. Each pin pair may
be placed into one of three states:
• Drive logic ‘1’
• Drive logic ‘0’
• Tri-state (high-impedance)
FIGURE 24-14:
DS41419B-page 232
Shutdown
PWM
CCPxASE bit
ENHANCED PWM AUTO-
SHUTDOWN MODE
Section 24.4.4 “Auto-Restart
Activity
Event
PWM AUTO-SHUTDOWN WITH FIRMWARE RESTART (PXRSEN = 0)
Overflow
Timer
Start of
PWM Period
PWM Period
(Auto-Shutdown)
Mode”).
Event Occurs
Missing Pulse
Overflow
Shutdown
Timer
Preliminary
Event Clears
Overflow
Shutdown
Timer
Note 1: The auto-shutdown condition is a level-
2: Writing to the CCPxASE bit is disabled
3: Once the auto-shutdown condition has
4: Prior to an auto-shutdown event caused
Missing Pulse
(CCPxASE not clear)
based signal, not an edge-based signal.
As long as the level is present, the auto-
shutdown will persist.
while
persists.
been removed and the PWM restarted
(either through firmware or auto-restart)
the PWM signal will always restart at the
beginning of the next PWM period.
by a comparator output or INT pin event,
a software shutdown can be triggered in
firmware by setting the CCPxASE bit of
the CCPxAS register to ‘1’. The Auto-
Restart feature tracks the active status of
a shutdown caused by a comparator out-
put or INT pin event only. If it is enabled at
this time, it will immediately clear this bit
and restart the ECCP module at the
beginning of the next PWM period.
Overflow
Cleared by
CCPxASE
Firmware
Timer
an
PWM
Resumes
 2010 Microchip Technology Inc.
auto-shutdown
Overflow
Timer
condition