MCP79412 datasheet(11/66 Pages) MICROCHIP

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DS20002266H-page 11

MCP79410/MCP79411/MCP79412

5.0

FUNCTIONAL DESCRIPTION

The MCP7941X is a highly-integrated Real-Time

Clock/Calendar

(RTCC).

Using

on-board,

low-power oscillator, the current time is maintained in

seconds, minutes, hours, day of week, date, month,

and year. The MCP7941X also features 64 bytes of

general purpose SRAM, 1 Kbit of EEPROM and eight

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 MCP7941X will automatically switch to

backup power when primary power is unavailable,

allowing the current time and the SRAM contents to be

maintained. The time-stamp 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

MCP7941X.

5.1

Memory Organization

The MCP7941X features four different blocks of

memory: the RTCC registers, general purpose SRAM,

1 Kbit EEPROM with software write-protect, and

protected EEPROM. The RTCC registers and SRAM

share the same address space, accessed through the

‘1101111X’ control byte. The EEPROM regions are in

a separate address space and are accessed using the

‘1010111X’

control

byte

(Figure 5-1).

Unused

locations are not accessible. The MCP7941X will not

acknowledge if the address is out of range, as shown

in the shaded region of the memory map in Figure 5-1.

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.

The EEPROM space is located in addresses

0x00-0x7F while the protected EEPROM section is

located in addresses 0xF0-0xF7. A STATUS register,

used to protect regions of the EEPROM section, is

located at address 0xFF.

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