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/* $OpenBSD: m41t8xreg.h,v 1.2 2010/02/19 14:58:13 miod Exp $ */
/*
* Copyright (c) 2010 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* ST M41T8x serial access real time clock registers
*
* http://www.st.com/stonline/products/literature/ds/9074/m41t80.pdf
*/
/*
* Note that register update will stop while accessing registers 0x00 to 0x07
* (without the clock stopping), so that the reader does not get false data.
* Registers will be thawed after reading register 0x07, when the
* autoincrementing read address reaches 0x08.
*
* Clock and alarm numerical values are stored in BCD. All other values are
* stored in binary.
*/
#define M41T8X_HSEC 0x00 /* 1/100th of second */
#define M41T8X_SEC 0x01 /* second */
#define M41T8X_STOP 0x80 /* stop clock, bit 7 of above */
#define M41T8X_MIN 0x02 /* minute */
#define M41T8X_HR 0x03 /* hour */
#define M41T8X_CEB 0x80 /* century bit toggle enable */
#define M41T8X_CB 0x40 /* century bit */
#define M41T8X_DOW 0x04 /* day of week */
#define M41T8X_DAY 0x05 /* day of month */
#define M41T8X_MON 0x06 /* month */
#define M41T8X_YEAR 0x07 /* year */
#define M41T8X_TOD_START 0x00
#define M41T8X_TOD_LENGTH 0x08
#define M41T8X_CTRL 0x08 /* control */
#define M41T8X_OUT 0x80 /* output level */
#define M41T8X_32KHZ 0x09 /* 32KHz oscillator control */
#define M41T8X_32KE 0x80 /* 32KHz enable */
#define M41T8X_ALMON 0x0a /* alarm month */
#define M41T8X_AFE 0x80 /* alarm flag enable */
#define M41T8X_SQWE 0x40 /* square wave enable */
#define M41T8X_ALDAY 0x0b /* alarm day */
#define M41T8X_RPT4 0x80 /* alarm repeat mode bits */
#define M41T8X_RPT5 0x40
#define M41T8X_ALHOUR 0x0c /* alarm hour */
#define M41T8X_RPT3 0x80
#define M41T8X_ALMIN 0x0d /* alarm minute */
#define M41T8X_RPT2 0x80
#define M41T8X_ALSEC 0x0e /* alarm second */
#define M41T8X_RPT1 0x80
#define M41T8X_FLAGS 0x0f /* flags */
#define M41T8X_AF 0x40 /* alarm flag */
#define M41T8X_SQW 0x13 /* square wave control */
#define M41T8X_RS3 0x80 /* square wave frequency */
#define M41T8X_RS2 0x40
#define M41T8X_RS1 0x20
#define M41T8X_RS0 0x10
/* alarm repeat settings, RPT5..RPT1 */
#define M41T8X_ALREP_SEC 0x1f /* once per second */
#define M41T8X_ALREP_MIN 0x1e /* once per minute */
#define M41T8X_ALREP_HOUR 0x1c /* once per hour */
#define M41T8X_ALREP_DAY 0x18 /* once per day */
#define M41T8X_ALREP_MON 0x10 /* once per month */
#define M41T8X_ALREP_YEAR 0x00 /* once per year */
/* square wave frequency, RS3..RS0 */
#define M41T8X_SQW_32K 0x01
#define M41T8X_SQW_8K 0x02
#define M41T8X_SQW_4K 0x03
#define M41T8X_SQW_2K 0x04
#define M41T8X_SQW_1K 0x05
#define M41T8X_SQW_512 0x06
#define M41T8X_SQW_256 0x07
#define M41T8X_SQW_128 0x08
#define M41T8X_SQW_64 0x09
#define M41T8X_SQW_32 0x0a
#define M41T8X_SQW_16 0x0b
#define M41T8X_SQW_8 0x0c
#define M41T8X_SQW_4 0x0d
#define M41T8X_SQW_2 0x0e
#define M41T8X_SQW_1 0x0f
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