cp2200 Silicon Laboratories, cp2200 Datasheet - Page 41

• Manufacturer Part Number: cp2200
• Description: Single-chip Ethernet Controller
• Manufacturer: Silicon Laboratories

9.6. Determining the Source of the Last Reset
The RSTSTA register can be used to determine the cause of the last reset. Note: If the PORSI bit is set to logic 1,
all other bits in RSTSTA are undefined. It is impossible to differentiate between a power-on, power-fail, and
oscillator-fail reset by reading the RSTSTA register.
Bits 7–3: UNUSED. Read = 00000b, Write = don’t care.
Bit 2:
Bit 1:
Bit 0:
R/W
Bit7
—
SWRSI: Software Reset Indicator
0: Source of last reset was not a write to RESET (SWRESET.2).
1: Source of last reset was a write to RESET (SWRESET.2).
PORSI: Power-On / Power-Fail / Oscillator-Fail Reset Indicator
0: Source of last reset was not a power-on, power-fail, or oscillator-fail event.
1: Source of last reset was a power-on, power-fail, or oscillator-fail event.
PINRSI: External Pin Reset Indicator
0: Source of last reset was not the /RST pin.
1: Source of last reset was the /RST pin.
R/W
Bit6
—
Register 13. RSTSTA: Reset Source Status Register
R/W
Bit5
—
R/W
Bit4
—
R/W
Bit3
—
Rev. 1.0
SWRSI
Bit2
R
PORSI
Bit1
R
PINRSI
Bit0
R
CP2200/1
00000000
Reset Value
Address:
0x73
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