MCP79522-ISLASHMS datasheet(11/58 Pages) MICROCHIP

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DS20002300D-page 11

MCP7951X/MCP7952X

5.0

FUNCTIONAL DESCRIPTION

The MCP795XX is a highly-integrated Real-Time

Clock/Calendar

(RTCC).

Using

on-board,

low-power oscillator, the current time is maintained in

hundredths of seconds, seconds, minutes, hours, day

of week, date, month and year. The MCP795XX also

features 64 bytes of general purpose SRAM, either

2 Kbits (MCP7952X) or 1 Kbit (MCP7951X) of

EEPROM and 16 bytes of protected EEPROM. Two

alarm modules allow interrupts to be generated at

specific times with flexible comparison options. Digital

trimming can be used to compensate for inaccuracies

inherent with crystals. Using the backup supply input

and an integrated power switch, the MCP795XX will

automatically switch to backup power when primary

power is unavailable, allowing the current time and the

SRAM contents to be maintained. The timestamp

module captures the time when primary power is lost

and when it is restored.

The RTCC configuration and STATUS registers are

used to access all of the modules featured on the

MCP795XX.

5.1

Memory Organization

The MCP795XX features four different blocks of

memory: the RTCC registers, general purpose SRAM,

2 Kbit EEPROM (1 Kbit for the MCP7951X) with

software write-protect and protected EEPROM. The

RTCC registers and SRAM share the same address

space and are accessed through the READ and WRITE

instructions. The EEPROM region is accessed using

the EEREAD and EEWRITE instructions and the

protected EEPROM is accessed using the IDREAD and

IDWRITE instructions. Unused locations are not

accessible. The MCP795XX will not return valid data if

the address is out of range, as shown in the shaded

region of the memory maps in Figure 5-1 and

Figure 5-2.

The RTCC registers are contained in addresses

0x00-0x1F. Table 5-1 shows the detailed RTCC

SRAM, located in the address range 0x20-0x5F. The

SRAM is a separate block from the RTCC registers. All

RTCC registers and SRAM locations are maintained

while operating from backup power.

FIGURE 5-1:

MEMORY MAP FOR MCP7951X

Time and Date

SRAM (64 Bytes)

Power-Fail/Power-Up Timestamps

Alarm 1

Alarm 0

Configuration and Trimming

0x00

0x07

0x08

0x0B

0x0C

0x11

0x12

0x17

0x18

0x1F

0x20

0x5F

0x60

0xFF

Unimplemented; device does not respond

RTCC Registers/SRAM

Protected EEPROM (8 Bytes)

0x00

0xFF

0x00

0x07

0x08

0x0F

Lockable User ID (8 Bytes)

EEPROM

EUI-48/EUI-64 Node Address

Unimplemented; mapped back to 0x00-0x7F

0x7F

0x80

EEPROM (128 Bytes)

Protected EEPROM

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