Difference between revisions of "Minimig RTC"
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| − | + | Real time clock that keeps the time over power cycling.<br> | |
| − | [http://amigahardware.mariomisic.de/cgi-bin/showhardware_en.cgi?HARDID=968 Commodore: A501, 512k + RTC]<br> | + | Advantages: |
| + | :* Disc files get correct date | ||
| + | :* Any software dependent on date will work correctly (astronomy/satellite?) | ||
| + | |||
| + | [http://amigahardware.mariomisic.de/cgi-bin/showhardware_en.cgi?HARDID=968 Commodore: A501 Rev5, 512k + RTC]<br> | ||
| + | :RAM organised as 16 x (Sanyo LM33256G-12 DIP16) 1 x 256kbit Dynamic RAM | ||
| + | :RTC 5 Volt "OKI M6242B" U9 DIP18 clocked with a 32768 Hz crystal, backed up by a 3,6V NiCd battery | ||
| + | <!-- amigahardware.mariomisic.de/download_photos/a501_1_big.jpg --> | ||
| + | :[http://www.tranzistoare.ro/datasheets2/18/182008_1.pdf M6242B datasheet] | ||
| + | |||
| + | :Register table:<!-- http://en.wikipedia.org/wiki/Help:Table#Positioning --> | ||
| + | :{| class="wikitable" | ||
| + | |- | ||
| + | ! rowspan=2 colspan=1 align="center" | Address Input | ||
| + | ! rowspan=2 colspan=1 align="center" | Register name | ||
| + | ! rowspan=1 colspan=4 align="center" | Data | ||
| + | ! rowspan=2 colspan=1 align="center" | Count value | ||
| + | ! rowspan=2 colspan=1 align="center" | Description | ||
| + | |- | ||
| + | ! D3 !! D2 !! D1 !! D0 | ||
| + | |- | ||
| + | | align="center"| 0 || S1 || S8 || S4 || S2 || S1 || 0-9 || 1-second digit register | ||
| + | |- | ||
| + | | align="center"|1 || S10 || * || S40 || S20 || S10 || 0-5 || 10-second digit register | ||
| + | |- | ||
| + | | align="center"|2 || MI1 || mi8 || mi4 || mi2 || mi1 || 0-9 || 1-minute digit register | ||
| + | |- | ||
| + | | align="center"| 3 || MI10 || * || mi40 || mi20 || mi10 || 0-5 || 10-minute digit register | ||
| + | |- | ||
| + | | align="center"| 4 || H1 || h8 || h4 || h2 || h1 || 0-9 || 1-hour digit register | ||
| + | |- | ||
| + | | align="center"| 5 || H10 || * || PM/AM || h20 || h10 || 0-2 or 0-1 || PM/AM 10-hour digit register | ||
| + | |- | ||
| + | | align="center"| 6 || D1 || d8 || d4 || d2 || d1 || 0-9 || 1-day digit register | ||
| + | |- | ||
| + | | align="center"| 7 || D10 || * || * || d20 || d10 || 0-3 || 10-day digit register | ||
| + | |- | ||
| + | | align="center"| 8 || MO1 || mo8 || mo4 || mo2 || mo1 || 0-9 || 1-month digit register | ||
| + | |- | ||
| + | | align="center"| 9 || MO10 || * || * || * || MO10 || 0-1 || 10-month digit register | ||
| + | |- | ||
| + | | align="center"| A || Y1 || y8 || y4 || y2 || y1 || 0-9 || 1-year digit register | ||
| + | |- | ||
| + | | align="center"| B || Y10 || y80 || y40 || y20 || y10 || 0-9 || 10-year digit register | ||
| + | |- | ||
| + | | align="center"| C || W || * || w4 || w2 || w1 || 0-6 || Week register (0=Sunday) | ||
| + | |- | ||
| + | | align="center"| D || CD || 30 sec. ADJ || IRQ FLAG || BUSY || HOLD || - || Control Register D | ||
| + | |- | ||
| + | | align="center"| E || CE || t1 || t0 || ITRPT /STND || MASK || - || Control Register E | ||
| + | |- | ||
| + | | align="center"| F || CF || TEST|| 24/12 || STOP || REST || - || Control Register F | ||
| + | |} | ||
| + | :REST = RESET | ||
| + | :ITRPT/STND = INTERRUPT/STANDARD | ||
| + | : | ||
| + | :<B>Note 1)</B> Bit * does not exist (unrecognized during a write and held at "0" during a read). | ||
| + | :<B>Note 2)</B> Be sure to mask the AM/PM bit when processing 10's of hour's data. | ||
| + | :<B>Note 3)</B> BUSY bit is read only. The IRQ FLAG bit can only be set to a "0". Setting the IRQ FLAG to a "1" is done by hardware. | ||
| + | :<B>Note 4)</B> PM at 1 and AM at 0 for PM / AM bit. | ||
| + | |||
| + | |||
[http://amigahardware.mariomisic.de/cgi-bin/showhardware_en.cgi?HARDID=1683 Micronik: Realtime Clock for Clockport, RTC]<br> | [http://amigahardware.mariomisic.de/cgi-bin/showhardware_en.cgi?HARDID=1683 Micronik: Realtime Clock for Clockport, RTC]<br> | ||
| + | |||
| + | Pin maps: | ||
| + | :[[Minimig Board v1.0 MCU connections|MCU pins]] | ||
| + | :[[Minimig Board v1.0 FPGA connections|FPGA pins]] | ||
Latest revision as of 18:49, 29 August 2007
Real time clock that keeps the time over power cycling.
Advantages:
- Disc files get correct date
- Any software dependent on date will work correctly (astronomy/satellite?)
Commodore: A501 Rev5, 512k + RTC
- RAM organised as 16 x (Sanyo LM33256G-12 DIP16) 1 x 256kbit Dynamic RAM
- RTC 5 Volt "OKI M6242B" U9 DIP18 clocked with a 32768 Hz crystal, backed up by a 3,6V NiCd battery
- M6242B datasheet
- Register table:
Address Input Register name Data Count value Description D3 D2 D1 D0 0 S1 S8 S4 S2 S1 0-9 1-second digit register 1 S10 * S40 S20 S10 0-5 10-second digit register 2 MI1 mi8 mi4 mi2 mi1 0-9 1-minute digit register 3 MI10 * mi40 mi20 mi10 0-5 10-minute digit register 4 H1 h8 h4 h2 h1 0-9 1-hour digit register 5 H10 * PM/AM h20 h10 0-2 or 0-1 PM/AM 10-hour digit register 6 D1 d8 d4 d2 d1 0-9 1-day digit register 7 D10 * * d20 d10 0-3 10-day digit register 8 MO1 mo8 mo4 mo2 mo1 0-9 1-month digit register 9 MO10 * * * MO10 0-1 10-month digit register A Y1 y8 y4 y2 y1 0-9 1-year digit register B Y10 y80 y40 y20 y10 0-9 10-year digit register C W * w4 w2 w1 0-6 Week register (0=Sunday) D CD 30 sec. ADJ IRQ FLAG BUSY HOLD - Control Register D E CE t1 t0 ITRPT /STND MASK - Control Register E F CF TEST 24/12 STOP REST - Control Register F
- REST = RESET
- ITRPT/STND = INTERRUPT/STANDARD
- Note 1) Bit * does not exist (unrecognized during a write and held at "0" during a read).
- Note 2) Be sure to mask the AM/PM bit when processing 10's of hour's data.
- Note 3) BUSY bit is read only. The IRQ FLAG bit can only be set to a "0". Setting the IRQ FLAG to a "1" is done by hardware.
- Note 4) PM at 1 and AM at 0 for PM / AM bit.
Micronik: Realtime Clock for Clockport, RTC
Pin maps:
