Rainbow Electronics AT91CAP9S250A - Manual (Page 121)

121
6264A–CAP–21-May-07
AT91CAP9S500A/AT91CAP9S250A
19. Shutdown Controller (SHDWC)
19.1 Description
The Shutdown Controller controls the power supplies VDDIO and VDDCORE and the wake-up
detection on debounced input lines.
19.2 Block Diagram
Figure 19-1. Shutdown Controller Block Diagram
19.3 I/O Lines Description
19.4 Product Dependencies
19.4.1 Power Management
The Shutdown Controller is continuously clocked by Slow Clock. The Power Management Con-
troller has no effect on the behavior of the Shutdown Controller.
19.5 Functional Description
The Shutdown Controller manages the main power supply. To do so, it is supplied with VDDBU
and manages wake-up input pins and one output pin,
SHDN .
Shutdown
Wake-up
Shutdown
Output
Controller
SHDN
WKUP0
SHDW
WKMODE0
Shutdown Controller
RTT Alarm
RTTWKEN
SYSC_SHMR
SYSC_SHMR
SYSC_SHCR
CPTWK0
WAKEUP0
RTTWK SYSC_SHSR
SYSC_SHSR
set
set
reset
reset
read SYSC_SHSR
read SYSC_SHSR
SLCK
Table 19-1. I/O Lines Description
Name Description Type
WKUP0 Wake-up 0 input Input
SHDN Shutdown output Output