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Programmer’s Reference
4-18 Copyright © 2003-2007 ARM Limited. All rights reserved. ARM DUI 0224F
Table 4-4 Register map for system control registers
Name Address
Access
a
Reset
level
Description
SYS_ID
0x10000000
Read only - System Identity. See ID Register, SYS_ID on
page 4-21.
SYS_SW
0x10000004
Read only - Bits [7:0] map to S6 (user switches)
SYS_LED
0x10000008
Read/Write 6 Bits [7:0] map to user LEDs (located next to S6)
SYS_OSC0
0x1000000C
Read/Write
Lockable
2 Settings for the ICS307 programmable oscillator chip
OSC0. This oscillator provides the PLLCLKEXT
and XTALCLKEXT signal sources. See Oscillator
registers, SYS_OSCx on page 4-23 and ARM926EJ-S
PXP Development Chip clocks on page 3-39.
SYS_OSC1
0x10000010
Read/Write
Lockable
2 Settings for the ICS307 programmable oscillator chip
OSC1. This oscillator provides the HCLKM1 signal
source.
SYS_OSC2
0x10000014
Read/Write
Lockable
2 Settings for the ICS307 programmable oscillator chip
OSC2. This oscillator provides the HCLKM2 signal
source.
SYS_OSC3
0x10000018
Read/Write
Lockable
2 Settings for the ICS307 programmable oscillator chip
OSC3. This oscillator provides the HCLKS signal
source.
SYS_OSC4
0x1000001C
Read/Write
Lockable
2 Settings for the ICS307 programmable oscillator chip
OSC4. This oscillator provides the CLCDCLKEXT
signal source.
SYS_LOCK
0x10000020
Read/Write 6 Write
0xA05F
to unlock. See Lock Register,
SYS_LOCK on page 4-24.
SYS_100HZ
0x10000024
Read only 0 100Hz counter.
SYS_CFGDATA1
0x10000028
Read/Write
Lockable
0 Configuration data to be applied to HDATAM1 pins
at power on or when the SDC CONFIG pushbutton is
pressed.
SYS_CFGDATA2
0x1000002C
Read/Write
Lockable
0 Configuration data to be applied to HDATAM2 pins
at power on or when the SDC CONFIG pushbutton is
pressed.