Topic : The ATARI Compendium
Author : Scott Sanders / JAY Software
Version : 1.25 (20/6/2003)
Subject : Documentation
Nodes : 1117
Index Size : 32614
HCP-Version : 6
Compiled on : Atari
@charset : UTF-8
@lang : en
@default :
@help : %About
@options : +g -i -t4 +y +z
@width : 100
View Ref-FileMega ST Real Time Clock (RP5C15)Location(s) SizeBYTE Occupies one byte (8 bits).
WORD Occupies one WORD (16 bits).
LONG Occupies one longword (32 bits).
OW Occupies the odd WORD of a LONG.
EW Occupies the even WORD of a LONG.
OB Occupies the odd BYTE of a WORD.
EB Occupies the even BYTE of the WORD.
MchnIf the box is shaded then address is available
for this computer.
▒ ▒ ▒ ▒ ▒ ▒
| | | | | '------- Falcon030
| | | | '--------- TT030
| | | '----------- MEGA STe
| | '------------- STe
| '--------------- MEGA ST
'----------------- STTypeROM Location is Read-Only Memory
RAM Location is Read-Write Memory
I/O Location is hardware-mapped
VME Location addresses VME address space
N/A Not applicable
RO Read-only location
WO Write-only location
RW Read-write location
RSVD Reserved
Unassigned Either not assigned or undocumented
Meaning (see Usage)
▒
0x00FFFC20 OB ▒ I/O Bank 0: Seconds-Ones (0-9)
▒ Bank 1: Clock output frequency as follows:
▒
▒ Value Meaning
▒ 0 Open-Collector "CLKOUT"
▒ 1 16384 Hz
▒ 2 1024 Hz
▒ 3 128 Hz
▒ 4 16 Hz
▒ 5 1 Hz
▒ 6 1/60 Hz
▒ 7 Open-Collector "CLKOUT"
▒
▒
0x00FFFC22 OB ▒ I/O Bank 0: Seconds-Tens (0-5)
▒ Bank 1: Setting bit #0 will reset the
▒ seconds register to the 0 and,
▒ if the seconds register is
▒ currently between 30-59,
▒ increment the minutes register
▒
▒
0x00FFFC24 OB ▒ I/O Bank 0: Minutes-Ones (0-9)
▒ Bank 1: Alarm Minutes-Ones (0-9)
▒
▒
0x00FFFC26 OB ▒ I/O Bank 0: Minutes-Tens (0-5)
▒ Bank 1: Alarm Minutes-Tens (0-5)
▒
▒
0x00FFFC28 OB ▒ I/O Bank 0: Hour-Ones (0-9)
▒ Bank 1: Alarm Hour-Ones (0-9)
▒
▒
0x00FFFC2A OB ▒ I/O Bank 0: Hour-Tens (0-2), in 24 hour mode,
▒ otherwise (0-1) in 12 hour mode
▒ with Bit 1 being set for PM,
▒ cleared for AM
▒ Bank 1: Alarm Hour-Tens (as in bank 0)
▒
▒
0x00FFFC2C OB ▒ I/O Bank 0: Day of Week (0-6), 0 = Sunday
▒ Bank 1: Alarm Day of Week (0-6), 0 = Sunday
▒
▒
0x00FFFC2E OB ▒ I/O Bank 0: Date-Ones (0-9)
▒ Bank 1: Alarm Date-Ones (0-9)
▒
▒
0x00FFFC30 OB ▒ I/O Bank 0: Date-Tens (0-3)
▒ Bank 1: Alarm Date-Tens (0-3)
▒
▒
0x00FFFC32 OB ▒ I/O Bank 0: Month-Ones (0-9)
▒ Bank 1: Not Used
▒
▒
0x00FFFC34 OB ▒ I/O Bank 0: Month-Tens (0-1)
▒ Bank 1: If Bit #1 is set then
▒ clock is in 24 hour
▒
▒
0x00FFFC36 OB ▒ I/O Bank 0: Year-Ones (0-9) The value for Year
▒ represents the (Year - 1980)
▒ Bank 1: Leap Year Register (0-3), 0 = Leap Year
▒
▒
0x00FFFC38 OB ▒ I/O Bank 0: Year-Tens (0-9)
▒ Bank 1: Not Used
▒
▒
0x00FFFC3A OB ▒ I/O Mode Register as follows:
▒
▒
▒
▒
▒
▒
▒
▒
▒
▒
0x00FFFC3C OB ▒ I/O Test Register (lower nibble must equal
▒ zero to show confirm proper functioning)
▒
▒
0x00FFFC3E OB ▒ I/O Reset Register as follows:
▒