MCP79411 datasheet(16/60 Pages) MICROCHIP

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MCP79410/MCP79411/MCP79412

DS20002266E-page 16

 2010-2013 Microchip Technology Inc.

6.0

CONTROL REGISTER

The Control register is used to enable additional

features of the RTCC, such as Alarms and MFP square

wave divider. This register also contains bits that can

be used to toggle the MFP pin and also allow the RTCC

to be driven by an external CMOS 32.768 kHz clock.

CONTROL REG 0X07

R/W-1

R/W-0

OUT

SQWE

ALM1

ALM0

EXTOSC

RS2

RS1

RS0

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: Level of MFP Pin bit

This bit sets the logic level on the MFP pin when not using this as a square wave output. This pin is

open-drain.

1 = Pin is not asserted

0 = Pin is logic low – asserted

bit 6

SQWE: Square Wave Enable bit

Setting this bit enables the divided output from the crystal oscillator

1 = Enable square wave

0 = Disable square wave

bit 5

ALM1: Alarm 1 Enable bit

1 = Alarm 1 enabled

0 = Alarm 1 disabled

bit 4

ALM0: Alarm 0 Enable bit

1 = Alarm 0 enabled

0 = Alarm 0 disabled

bit 3

EXTOSC: External Oscillator Input bit

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

0 = Disable external 32.768 kHz input.

bit 2

RS2: Digital Trimming/Digital Calibration Mode bit

This bit is used to switch between Digital Trimming and Digital Calibration mode

1 = Enable the Digital Calibration mode. Calibration signal appears on CLKOUT if SQWE is set (64 Hz

nominal, see Section 8.4 “Digital Calibration Mode”).

0 = Disable the calibration output function, Digital trimming is enabled, see Section 8.3 “Digital Trim-

ming”.

bit 1-0

RS<1:0>: CLKOUT Divider bits

Sets the internal divider for the 32.768 kHz oscillator to be driven to the CLKOUT. The following

frequencies are available. The output is responsive to the Calibration register, see Section 3.4 “MFP

(Multifunction Pin)”.

- 00 – 1 Hz

- 01 – 4.096 kHz

- 10 – 8.192 kHz

- 11 – 32.768 kHz

Note 1:

When RS2 is set to enable the calibration output function, the RTCC counters will continue to increment.

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