MCP795W20-I/ST View Datasheet(PDF) - Microchip Technology
Part Name
Description
Manufacturer
MCP795W20-I/ST Datasheet PDF : 54 Pages
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MCP795W1X/MCP795W2X
REGISTER 5-9: CONTROL REG 0X08
R/W
R/W
R/W
R/W
R/W
R/W
OUT
SQWE
ALM1
ALM0
EXTOSC
RS2
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
R/W
RS1
bit 1
R/W
RS0
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
bit 7
bit 6
bit 5-4
bit 3
bit 2-0
OUT: Output Polarity of MFP bit
This bit sets the logic level on the CLKOUT when not using this as a square wave output.
SQWE: Squarewave Enable bit
Setting this bit enables the divided output from the crystal oscillator.
ALM<1:0>: Alarm Configuration bits
These bits determine which alarms are active
- 00 – No Alarms are active
- 01 – Alarm 0 is active
- 10 – Alarm 1 is active
- 11 – Both Alarms are active
EXTOSC: External Oscillator Input bit
Enable bit. Setting this bit will allow an external 32.768 kHz signal to drive the RTCC registers,
eliminating the need for an external crystal.
RS<2:0>: Calibration Mode 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.
- 000 – 1 Hz
- 001 – 4.096 kHz
- 010 – 8.192 kHz
- 011 – 32.768 kHz
- 1XX – enables the Cal output function. Cal output appears on CLKOUT if SQWE is set (1 Hz
nominal).
Note 1: When RS2 is set to enable the Cal output function, the RTCC counters will continue to increment.
REGISTER 5-10: CALIBRATION 0X09
R/W
CALIBRATION
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
bit 7-0
CALIBRATION VALUE<7:0>: Calibration Value bits
Note 1:
This is an 8-bit register that is used to add or subtract clocks from the RTCC counter every minute. The
CALSGN (0x03:7) is the sign bit and indicates if the count should be added or subtracted. The eight bits in
the Calibration register, with each bit adding or subtracting two clocks, gives the user the ability to add or
subtract up to 510 clocks per minute.
2011-2012 Microchip Technology Inc.
Preliminary
DS22280C-page 15
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