AC164140 Microchip Technology, AC164140 Datasheet - Page 13

• Manufacturer Part Number: AC164140
• Description: MCP79410 RTCC PICtail Plus Daughter Board Memory Kits
• Manufacturer: Microchip Technology
• Series: PICtail™ Plusr

Specifications of AC164140

• Main Purpose: Timing, Real Time Clock (RTC)
• Embedded: -
• Utilized Ic / Part: MCP79410
• Primary Attributes: For Use With Explorer 16, PICDEM PIC18 Explorer, XLP DEV Board, PICkit Serial Analyzer
• Secondary Attributes: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

• ALMxC2:0: These Configuration bits determine
• The 12/24-hour bits 0xCh.6 and 0x13h.6 are cop-
0x18h-0x1Bh are used for the timesaver function.
These registers are loaded at the time when V
and the RTCC operates on the V
also set at this time. These registers are cleared when
the V
0x1Ch-0x1Fh are used for the timesaver function.
These registers are loaded at the time when V
restored and the RTCC switches to V
registers are cleared when the V
software.
 2011 Microchip Technology Inc.
000 –
001 –
010 –
011 –
100
101
110
111
the alarm match. The logic will trigger the alarm
based on one of the following match conditions:
ies of the bit in 0x02h.6. The bits are read-only.
Note:
BAT
– Date
– RESERVED
– RESERVED
– Seconds, Minutes, Hour, Day, Date,
bit is cleared in software.
It is strongly recommended that the
timesaver function only be used when the
oscillator is running. This will ensure
accurate functionality.
Seconds match
Minutes match
Hours match (takes into account 12/24
hour)
Matches the current day, interrupt at
12.00.00 a.m. Example: 12 midnight on
Month
BAT
BAT
. The V
bit is cleared in
DD
BAT
. These
CC
CC
bit is
fails
Preliminary
is
4.2
4.2.1
The STATUS register is in the nonvolatile EEPROM
array. To access the STATUS register, the address of
0xFFh is written to and read from. ACK polling may be
used to determine if the write is complete. The bits in
this register are defined as:
• Bit 3:2 are the EEPROM array block protection
• The unused bits are reserved at this time and
• With the current address read operation, the
If multiple bytes are loaded to the STATUS register,
only the last byte is written.
4.2.2
The unique ID location is user accessible by using the
unlock ID sequence.
The unique ID location is 64-bits (8 bytes) and is
stored in EEPROM locations 0xF0 to 0xF7. This
location can be read at any time, however, a write is
inhibited until unlocked.
To unlock the write access to this location the following
sequence must be completed:
• A single write of 0x55h to address 0x09. Stop
• A single write of 0xAAh to address 0x09. Stop
This will allow the unique EEPROM locations to be
written.
After the byte or page write to these locations, the
write sequence is initiated by the Stop condition. At
this time, the ID locations are locked and no further
writes are possible to this location unless a complete
unlock sequence is repeated.
bits. These bits are in the nonvolatile EEPROM
array. This allows protection of the following
areas:
- 00 – None of the array is protected.
- 01 – The upper 1/4 of the array 0x60h-0x7fh
- 10 – The upper 1/2 of the array 0x40h-0x7fh
- 11 – All of the array 0x00-0x7fh is protected.
read as ‘0’.
address is not incremented. Consequently, the
subsequent reads are done from the same
location.
is protected.
is protected.
FEATURES
STATUS REGISTER
UNLOCK SEQUENCE
MCP7941X
DS22266B-page 13