mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 124

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

All other circuits are powered by the normal supply pins—VDDH and VDDL—and VSS.
VDDH feeds the I/O buffers and logic and VDDL supplies the internal chip logic to reduce
system power consumption. However, the power supply connected to VDDH must be larger
or equal to the one connected to VDDL. The power supply for each block is listed in Table 5-
5 and described in Section 5.4 Power Control .
The following are the power supply requirements of the MPC823:
5.4.2 Keep-Alive Power
When the MPC823 is in normal operation mode, the keep-alive power supply (KAPWR) is
powered to the same voltage value as that of the I/O buffers and logic. Therefore, if the
VDDL and VDDH is 3.3V, then the KAPWR is 2.9V to 3.3V.
• VDDH = VDDSYN = 3.3V 5%
• VDDH
• VDDH
• KAPWR
I/O Pad
CLKOUT
Digital SPLL
Clock Control
Internal Logic
Clock Drivers
Analog SPLL
Main Clock Oscillator
SCCR, PLPRCR, and RSR
Real-Time Clock, Periodic
Interrupt Timer, Timebase and
Decrementer
VDDL
KAPWR
BLOCK
2.5V 5% in power-down mode
3.3V 5%
Freescale Semiconductor, Inc.
VDDH – 0.4V for normal operation
For More Information On This Product,
Table 5-5. MPC823 Power Supply
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
VDDH
X
X
X
X
VDDL
X
X
VDDSYN
X
Clocks and Power Control
KAPWR
X
X
X
X
5-25