16
DS508UM1
When first powered, or reset by the nPOR (Power On Reset, active low) signal, the EP7312 is forced into
the Standby State. This is known as a cold reset, and when leaving the Standby State after a cold reset,
external wake up is the only way to wake up the device. When leaving the Standby State after non-cold
reset conditions (i.e., the software has forced the device into the Standby State), the transition to the Oper-
ating State can be caused by a rising edge on the WAKEUP input signal or by an enabled interrupt. Nor-
mally, when entering the Standby State from the Operating State, the software will leave some interrupt
sources enabled.
Note:
The CPU cannot be awakened by the TINT, WEINT, and BLINT interrupts when in the Standby State.
Address (W/B)
Operating
Idle
Standby
nPOR
RESET
nURESET
RESET
SDRAM Control
On
On
SELFREF
Off
N/A
UARTs
On
On
Off
Reset
Reset
LCD FIFO
On
On
Reset
Reset
Reset
LCD
On
On
Off
Reset
Reset
ADC Interface
On
On
Off
Reset
Reset
SSI2 Interface
On
On
Off
Reset
Reset
DAI Interface
On
On
Off
Reset
Reset
CODEC
On
On
Off
Reset
Reset
Timers
On
On
Off
Reset
Reset
RTC
On
On
On
On
On
LED Flasher
On
On
On
Reset
Reset
DC-to-DC
On
On
Off
Reset
Reset
CPU
On
Off
Off
Reset
Reset
Interrupt Control
On
On
On
Reset
Reset
PLL/CLKEN Signal
On
On
Off
Off
Off
Table 4. Peripheral Status in Different Power States
Summary of Contents for EP7312
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