MCP795B10 MAS [Micro Analog systems], MCP795B10 Datasheet - Page 7

• Manufacturer Part Number: MCP795B10
• Description: SPI Real-Time Clock Calendar
• Manufacturer: MAS [Micro Analog systems]

2.11
The RTCC registers are contained in addresses 0x00h-
0x1fh. 64 bytes of user-accessable SRAM are located
in the address range 0x20-0x5f. The SRAM memory is
a separate block from the RTCC control and Configura-
tion registers. All SRAM locations are battery-backed-
up during a V
accessible.
• Addresses 0x00h-0x07h are the RTCC Time and
• Incorrect data can appear in the Time and Date
FIGURE 2-2:
 2011 Microchip Technology Inc.
Date registers. These are read/write registers.
Care must be taken when writing to these regis-
ters with the oscillator running.
registers if a write is attempted during the time
frame where these internal registers are being
incremented. The user can minimize the
likelihood of data corruption by ensuring that any
writes to the Time and Date registers occur before
the contents of the second register reach a value
of 0x59H.
0x0B
0x0C
0x00
0x07
0x09
0x11
0x12
0x17
0x18
0x1F
0x20
0x5F
RTCC Memory Map
CC
power fail. Unused locations are not
Configuration and Calibration
MEMORY MAP
RTCC Register/SRAM
SRAM (64 Bytes)
Time and Date
Time-Stamp
Alarm 0
Alarm 1
MCP795WXX/MCP795BXX
Preliminary
0xFF
0x00
0x00
0x07
0x08
0x0F
• Addresses 0x08h-0x0Bh are the device Configu-
• Addresses 0x0ch-0x11h are the Alarm 0 registers.
• Addresses 0x12h-0x17h are the Alarm 1 regis-
• Addresses 0x18h-0x1Fh are used for the Power-
ration, Calibration, Watchdog Configuration and
Event Detect Configuration registers.
These are used to set up the Alarm 0, the inter-
rupt pin and the Alarm 0 compare.
ters. These are used to set up the Alarm 1, the
interrupt pin and the Alarm 1 compare, Alarm 1
offers a enhanced resolution of tenth and
hundredths of seconds.
Down and Power-Up time-stamp feature. The
detailed memory map is shown in
error checking is provided when loading Time and
Date registers.
Note: 1K EEPROM Max address is 0x7F.
Unique ID Location 1
Unique ID Location 2
Unique ID
EUI-48/64
EEPROM
EEPROM
Memory
Table
DS22280A-page 7
4-1. No