Rainbow Electronics AT75C220 - Manual (Page 15)

AT75C220
15
SIAP-E Reset Status Register
Register Name: SIAP_RST
Access: Read/write
Reset Value: 0x00000001
• RST[2:0]: Reset
These bits indicate the cause of the last reset.
SIAP-E Clock Status Register
Register Name: SIAP_CLKF
Access: Read-only
Reset Value: 0x00000001
• CLK: Clock Status
This bit indicates which clock is in use by the system. When set, the low power clock is in use. When cleared, the PLL
is locked and the high power clock is in use. This can be used by software to determine when the power mode has
changed after the LP bit has been written.
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
– – – – – RST RST RST
RST Reset Event
0 0 1 Hardware
0 1 0 Watchdog Timer
1 0 0 Software
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
– – – – – – – CLK