System Power States; Table 5-4. Peripherals With Pclk Gating - Cirrus Logic EP93 Series User Manual

System Controller
EP93xx User's Guide
5
HCLK to the USB Hosts can be gated off as well to further save power. The USH_EN bit in
the "PwrCnt"

5.1.6.2 System Power States

The EP93xx has three power states:
• Run mode: Normal operation mode.
• Halt: ARM Core stops executing instructions.
• Standby: Power is on, but only SDRAM self-refresh and the RTC run.
Figure 5-4
5-10

Table 5-4. Peripherals with PCLK Gating

Peripheral/PCLK
Peripheral on with Enable or
Register Access
UART1
UART2
UART3
KEYPAD
IRDA
SEC
2
I S
Watchdog
TSC
PWM
AAC
SSP
RTC
GPIO
register serves the purpose.
illustrates the transitions among power states.
Copyright 2007 Cirrus Logic
PCLK on with
Register Access
Only
x -
x -
x -
- x
x -
x -
x -
- -
-
x
x -
x -
x -
- -
- x
PCLK Continuous
-
-
-
-
-
-
-
x
-
-
-
-
x
-
DS785UM1