Index
Élan™SC520 Microcontroller User’s Manual Index-21
page-mode read access, 12-10
single CPU read access, 12-9
word write cycle to Flash memory (figure), 12-12
writing to Flash, 12-11
cacheability control, 3-12
code execution control, 3-12
configuration, 12-7
access timing, 12-8
operating mode, 12-7
ROM location, 12-7
ROM width, 12-7
configuring external ROM devices
boot device mapping for BIOS shadowing, 3-17
two Flash banks for XIP operating system, 3-17
device types supported, 12-6
initialization, 12-14
CFGx options for BOOTCS
(table), 12-14
latency, 12-13
memory space, 4-4
operation, 12-5
overview, 12-1
programming Flash, 12-12
registers, 12-5
sharing address and data bus with GP bus, 13-10
signal descriptions, 2-6
software considerations, 12-12
system design, 12-2
data bus connection options (table), 12-1
shared signals (table), 12-3
voltage isolation, 12-3
voltage isolation examples (figure), 12-4
write-protection, 3-12, 3-18
ROM/Flash controller data bus, 2-8
ROM/Flash Read signal.
See
ROMRD signal.
ROMBUFOE
signal
description, 2-6
usage, 2-8, 12-3
ROMCS1
Control (ROMCS1CTL) register
function, 12-5
usage, 12-14
ROMCS1CTL register, 12-5
ROMCS2
Control (ROMCS2CTL) register
function, 12-5
usage, 12-14
ROMCS2CTL register, 12-5
ROMCS2
–ROMCS1 signals
control, 3-10, 12-3, 13-3, 13-6
description, 2-6
usage, 3-17, 4-8, 4-14, 12-3, 12-14, 24-6
ROMRD
signal
description, 2-6
usage, 12-3, 24-4, 24-6
Row Address Strobe signals.
See
SRASA–SRASB
signals.
RST
signal
control, 9-29
description, 2-7
usage, 6-4, 6-7, 9-2, 9-3, 9-29
RSTLD7–RSTLD0 signals
description, 2-14
usage, 6-3, 6-4, 6-5, 6-6
RTC.
See
real-time clock (RTC).
RTC Alarm Hour (RTCALMHR) register
function, 20-6
usage, 20-7, 20-10
RTC Alarm Minute (RTCALMMIN) register
function, 20-6
RTC Alarm Second (RTCALMSEC) register
function, 20-6
RTC Control A (RTCCTLA) register
function, 20-7
usage, 20-7, 20-8, 20-10
RTC Control B (RTCCTLB) register
function, 20-7
usage, 20-7, 20-9, 20-10
RTC Current Day of the Month (RTCCURDOM) register
function, 20-6
RTC Current Day of the Week (RTCCURDOW) register
function, 20-6
RTC Current Hour (RTCCURHR) register
function, 20-6
usage, 20-7
RTC Current Minute (RTCCURMIN) register
function, 20-6
RTC Current Month (RTCCURMON) register
function, 20-6
RTC Current Second (RTCCURSEC) register
function, 20-6
RTC Current Year (RTCCURYR) register
function, 20-6
usage, 20-9
RTC Interrupt Mapping (RTCMAP) register
function, 15-5
RTC Status C (RTCSTAC) register
function, 20-7
RTC Status D (RTCSTAD) register
function, 20-7
usage, 6-7, 20-4
RTC/CMOS RAM Data Port (RTCDATA) register
function, 20-6
usage, 20-10
RTC/CMOS RAM Index (RTCIDX) register
function, 20-6
usage, 20-10
RTC_DIS bit field, 3-21, 20-5
RTC_VRT bit field, 6-7, 20-4
RTCALMHR register, 20-6
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