MCP7940N-ESLASHMS datasheet(26/58 Pages) MICROCHIP

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MCP7940N

DS20005010J-page 26

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CONTROL: RTCC CONTROL REGISTER (ADDRESS 0x07)

R/W-1

R/W-0

OUT

SQWEN

ALM1EN

ALM0EN

EXTOSC

CRSTRIM

SQWFS1

SQWFS0

bit 7

bit 6

bit 5

bit 4

bit 3

bit 2

bit 1

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is clear

x = Bit is unknown

bit 7

OUT: Logic Level for General Purpose Output bit

Square Wave Clock Output Mode (SQWEN = 1):

Unused.

Alarm Interrupt Output mode (ALM0EN = 1 or ALM1EN = 1):

Unused.

General Purpose Output mode (SQWEN = 0, ALM0EN = 0, and ALM1EN = 0):

1 = MFP signal level is logic high

0 = MFP signal level is logic low

bit 6

SQWEN: Square Wave Output Enable bit

1 = Enable Square Wave Clock Output mode

0 = Disable Square Wave Clock Output mode

bit 5

ALM1EN: Alarm 1 Module Enable bit

1 = Alarm 1 enabled

0 = Alarm 1 disabled

bit 4

ALM0EN: Alarm 0 Module Enable bit

1 = Alarm 0 enabled

0 = Alarm 0 disabled

bit 3

EXTOSC: External Oscillator Input bit

1 = Enable X1 pin to be driven by external 32.768 kHz source

0 = Disable external 32.768 kHz input

bit 2

CRSTRIM: Coarse Trim Mode Enable bit

Coarse Trim mode results in the MCP7940N applying digital trimming every 64 Hz clock cycle.

1 = Enable Coarse Trim mode. If SQWEN = 1, MFP will output trimmed 64 Hz(1) nominal clock signal.

0 = Disable Coarse Trim mode

See Section 5.6 “Digital Trimming” for details

bit 1-0

SQWFS<1:0>: Square Wave Clock Output Frequency Select bits

If SQWEN = 1 and CRSTRIM = 0:

Selects frequency of clock output on MFP

00 = 1 Hz(1)

01 = 4.096 kHz(1)

10 = 8.192 kHz(1)

11 = 32.768 kHz

If SQWEN = 0 or CRSTRIM = 1:

Unused.

Note 1: The 8.192 kHz, 4.096 kHz, 64 Hz, and 1 Hz square wave clock output frequencies are affected by digital

trimming.

MCP7940N-E/MS Datasheet(PDF) 26 Page - Microchip Technology

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