MA240029 Microchip Technology, MA240029 Datasheet - Page 287

• Manufacturer Part Number: MA240029
• Description: Daughter Cards & OEM Boards PIC24FJ128GA310 Gen Purpose PIM
• Manufacturer: Microchip Technology

Specifications of MA240029

• Rohs: yes
• Product: Daughter Cards
• Core: PIC
• Description/function: Plug-in module
• Interface Type: I2C, SPI
• Tool Is For Evaluation Of: PIC24FJ128GA310
• For Use With: Explorer 16 Development Board

FIGURE 22-2:
22.6
The RTCC includes a power control feature that allows
the device to periodically wake-up an external device,
wait for the device to be stable before sampling
wake-up events from that device, and then shut down
the external device. This can be done completely
autonomously by the RTCC, without the need to wake
from the current lower power mode (Sleep, Deep
Sleep, etc.).
To use this feature:
1.
2.
3.
The polarity of the PWC control signal may be chosen
using the PWCPOL bit (RTCPWC<14>). An active-low
or active-high signal may be used with the appropriate
external switch to turn on or off the power to one or
more external devices. The active-low setting may also
be used in conjunction with an open-drain setting on
the RTCC pin, in order to drive the ground pin(s) of the
external device directly (with the appropriate external
V
switches. Finally, the CHIME bit should be set to enable
the PWC periodicity.
 2010-2011 Microchip Technology Inc.
DD
Enable the RTCC (RTCEN = 1).
Set the PWCEN bit (RTCPWC<15>).
Configure the RTCC pin to drive the PWC control
signal (RTCOE = 1 and RTCOUT<1:0> = 11).
pull-up device), without the need for external
POWER CONTROL
Note 1:
0000 - Every half second
0001 - Every second
0010 - Every 10 seconds
0011 - Every minute
0100 - Every 10 minutes
0101 - Every hour
0110 - Every day
0111 - Every week
1000 - Every month
1001 - Every year
Alarm Mask Setting
(AMASK<3:0>)
Annually, except when configured for February 29.
ALARM MASK SETTINGS
(1)
Day of
Week
the
PIC24FJ128GA310 FAMILY
d
Month
m
m
22.7
The RTCC can operate in V
power loss on the V
operate if the V
connected to the battery).
The V
VBTBOR bit in the CW3 Configuration register
(CW3<7>). If the VBTBOR enable bit is cleared, the
V
cation of a V
RTCC can receive a Reset and the RTCEN bit will get
cleared; it can happen anywhere between 1.95-1.4V
(typical).
BAT
Note:
d
d
Day
BOR is always disabled and there will be no indi-
BAT
d
d
RTCC V
BOR can be enabled/disabled using the
It is recommended to connect the V
pin to V
(not connected to the battery).
BAT
Hours
h
h
h
h
BAT
BOR. If the VBTBOR bit is set, the
BAT
h
h
h
h
DD
DD
pin is powered on (it is usually
pin. The RTCC will continue to
if the V
OPERATION
Minutes
m
m
m
m
m
BAT
m
m
m
m
m
m
BAT
mode when there is a
mode is not used
DS39996F-page 287
Seconds
s
s
s
s
s
s
s
s
s
s
s
s
s
s
s
BAT