SA1110 Datasheet, PDF (114/406 Pages) Intel Corporation – Intel StrongARM SA-1110 Microprocessor

System Control Module
9.6.1.2
Reset Controller Status Register (RCSR)
The reset controller reset status register (RCSR) is used by the CPU to determine the last cause or
causes of the reset. The SA-1110 has four sources of reset:
• Hardware reset
• Software reset
• Watchdog reset
• Sleep mode reset
Each RCSR status bit is set by a different source of reset, and can be cleared by writing a one back to that
bit. Note that the hardware reset state of software, watchdog, and sleep mode reset bits is zero. The table
below shows the status bits within RCSR. For reserved bits, writes are ignored and reads return zero.
0h 9003 0004
RCSR
Read/Write
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Reserved
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
Bits
0
1
2
3
31..4
Name
HWR
SWR
WDR
SMR
—
Description
Hardware reset.
0 – Hardware reset has not occurred since the last time the CPU cleared this bit.
1 – Hardware reset has occurred since the last time the CPU cleared this bit.
Software reset.
0 – Software reset has not occurred since the last time the CPU cleared this bit.
1 – Software reset has occurred since the last time the CPU cleared this bit.
Watchdog reset.
0 – Watchdog reset has not occurred since the last time the CPU cleared this bit.
1 – Watchdog reset has occurred since the last time the CPU cleared this bit.
Sleep mode reset.
0 – Sleep mode reset has not occurred since the last time the CPU cleared this bit.
1 – Sleep mode reset has occurred since the last time the CPU cleared this bit.
Reserved
9.6.2
Table 9-5.
Reset Controller Register Locations
Table 9-5 shows the registers associated with the reset controller and the physical addresses used to
access them.
Reset Controller Register Locations
Address
0h 9003 0000
0h 9003 0004
Name
RSRR
RCSR
Description
Reset controller software reset register
Reset controller status register
9-44
SA-1110 Developer’s Manual