Datasheet

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DS39995D-page 186  2011-2013 Microchip Technology Inc.
19.2 RTCC Module Registers
The RTCC module registers are organized into three
categories:
• RTCC Control Registers
• RTCC Value Registers
• Alarm Value Registers
19.2.1 REGISTER MAPPING
To limit the register interface, the RTCC Timer and
Alarm Time registers are accessed through corre-
sponding register pointers. The RTCC Value Register
Window (RTCVALH and RTCVALL) uses the RTCPTR
bits (RCFGCAL<9:8>) to select the desired Timer
register pair (see Table 19-1).
By writing the RTCVALH byte, the RTCC Pointer value,
the RTCPTR<1:0> bits decrement by one until they
reach ‘00’. Once they reach ‘00’, the MINUTES and
SECONDS value will be accessible through RTCVALH
and RTCVALL until the pointer value is manually
changed.
TABLE 19-1: RTCVAL REGISTER MAPPING
The Alarm Value Register Window (ALRMVALH
and ALRMVALL) uses the ALRMPTRx bits
(ALCFGRPT<9:8>) to select the desired Alarm
register pair (see Table 19-2).
By writing the ALRMVALH byte, the Alarm Pointer
value (ALRMPTR<1:0> bits) decrements by one until
they reach ‘00’. Once they reach ‘00’, the ALRMMIN
and ALRMSEC value will be accessible through
ALRMVALH and ALRMVALL, until the pointer value is
manually changed.
TABLE 19-2: ALRMVAL REGISTER
MAPPING
Considering that the 16-bit core does not distinguish
between 8-bit and 16-bit read operations, the user must
be aware that when reading either the ALRMVALH or
ALRMVALL bytes, the ALRMPTR<1:0> value will be
decremented. The same applies to the RTCVALH or
RTCVALL bytes with the RTCPTR<1:0> being
decremented.
19.2.2 WRITE LOCK
In order to perform a write to any of the RTCC Timer
registers, the RTCWREN bit (RTCPWC<13>) must be
set (see Example 19-1).
19.2.3 SELECTING RTCC CLOCK SOURCE
There are four reference source clock options that can
be selected for the RTCC using the RTCCSEL<1:0>
bits: 00 = Secondary Oscillator, 01 = LPRC, 10 = 50 Hz
External Clock and 11 = 60 Hz External Clock.
EXAMPLE 19-1: SETTING THE RTCWREN BIT
RTCPTR<1:0>
RTCC Value Register Window
RTCVAL<15:8> RTCVAL<7:0>
00 MINUTES SECONDS
01 WEEKDAY HOURS
10 MONTH DAY
11 — YEAR
ALRMPTR
<1:0>
Alarm Value Register Window
ALRMVAL<15:8> ALRMVAL<7:0>
00 ALRMMIN ALRMSEC
01 ALRMWD ALRMHR
10 ALRMMNTH ALRMDAY
11 PWCSTAB PWCSAMP
Note: This only applies to read operations and
not write operations.
Note: To avoid accidental writes to the timer, it is
recommended that the RTCWREN bit
(RCFGCAL<13>) is kept clear at any
other time. For the RTCWREN bit to be
set, there is only one instruction cycle time
window allowed between the 55h/AA
sequence and the setting of RTCWREN.
Therefore, it is recommended that code
follow the procedure in Example 19-1.
asm volatile (“push w7”);
asm volatile (“push w8”);
asm volatile (“disi #5”);
asm volatile (“mov #0x55, w7”);
asm volatile (“mov w7, _NVMKEY”);
asm volatile (“mov #0xAA, w8”);
asm volatile (“mov w8, _NVMKEY”);
asm volatile (“bset _RCFGCAL, #13”); //set the RTCWREN bit
asm volatile (“pop w8”);
asm volatile (“pop w7”);