Hardware Description
10
4.10. Power Management Controller (PMC)
4.10.1. Function
The PMC has a Peripheral Clock register which allows enabling or disabling of the clocks
of all integrated peripherals individually using their "Peripheral Identifier" (see Table B.1,
“Peripheral Identifiers”). The System Clock register allows enabling or disabling of each
of the following clocks individually:
• Processor Clock
• LCD Clock (HCK1)
• USB Host Clock (common for both channels)
• USB Device Clock
• Programmable Clocks
The PMC status register provides "Clock Ready" or, respectively, "PLL Lock" status bits
for each of these clocks. An interrupt is generated when any of these bits changes from
0 to 1. The PMC provides status flags for the
• Main Oscillator
• Master Clock
• PLLA
• PLLB
• Programmable Clocks
The Main Oscillator frequency can be measured by using the PMC Main Clock Frequency
register. The SLCK is used as reference for the measurement.
4.10.2. Power Management
Using power management can dramatically reduce the power consumption of an
Embedded Device. Via the PMC various clocks can be disabled or their speed reduced:
• stopping the PLLs (PLLA and / or PLLB)
• stopping the clocks of the various peripherals
• reducing the clock rates of peripherals, especially by changing MCK.
The PMC supports the following power-saving features: Idle mode and power-down mode.
Please note, that not every operating system supports these modes.
•
Idle Mode.
In idle mode, the processor clock will be re-enabled by any interrupt. The
peripherals, however, are only able to generate an interrupt if they still have a clock, so
care has to be taken as to when a peripheral can be powered down.
Summary of Contents for Panel-Card
Page 1: ...Panel Card Technical Reference ...
Page 32: ...Panel Card Starterkit 26 Figure 6 1 Panel Card EVB Schematics Bus JTAG ...
Page 33: ...Panel Card Starterkit 27 Figure 6 2 Panel Card EVB Schematics USB RS232 ...
Page 34: ...Panel Card Starterkit 28 Figure 6 3 Panel Card EVB Schematics Power Regulation ...
Page 35: ...Panel Card Starterkit 29 Figure 6 4 Panel Card EVB Schematics Connectors ...
Page 36: ...Panel Card Starterkit 30 Figure 6 5 Panel Card EVB Schematics HID ...
Page 39: ...Panel Card Starterkit 33 Figure 6 8 Panel Card Connector Schematics USB Ethernet ...
Page 49: ...Panel Card Dimensions 43 Appendix H Panel Card Dimensions Figure H 1 Panel Card 35 Dimensions ...
Page 50: ...Panel Card Dimensions 44 Figure H 2 Panel Card 57 Dimensions ...
