Clocks and Power Control
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
8-23
8.8.2.9
VDDH
VDDH provides power for the 5-V I/O operations. It is a nominal 5.0 V.
8.8.2.10
IRAMSTBY
IRAMSTBY is the data retention power supply for all on-board RAM arrays (CALRAM, DPTRAM,
DECRAM). It has a shunt regulator circuit of approximately 1.7 volts that diverts excess current to ground
in order to regulate voltage on the IRAMSTBY power supply pin. Run current is supplied by normal VDD.
IRAMSTBY must be connected to a positive power supply, via a register, and bypassed by a capacitor to
ground (see
. The resistor should sized according to the following equations:
where V
SUPPLYMIN
is the lowest supply voltage and V
SUPPLYMAX
is the highest possible supply voltage.
See note in the VSRMCR[ZOREG] bit description.
Figure 8-10. IRAMSTBY Regulator Circuit
8.8.2.11
VSS
VSS provides the ground reference for the MPC561/MPC563.
(V
SUPPLYMIN
– 1.95 V)
R
SUPPLY
> 50
µ
A
(V
SUPPLYMAX
– 1.35 V)
R
SUPPLY
<1.75 mA (average)
IRAMSTBY
V
SUPPLY
R
SUPPLY
C
SUPPLY
Summary of Contents for MPC561
Page 84: ...MPC561 MPC563 Reference Manual Rev 1 2 lxxxiv Freescale Semiconductor...
Page 144: ...Signal Descriptions MPC561 MPC563 Reference Manual Rev 1 2 2 46 Freescale Semiconductor...
Page 206: ...Central Processing Unit MPC561 MPC563 Reference Manual Rev 1 2 3 62 Freescale Semiconductor...
Page 302: ...Reset MPC561 MPC563 Reference Manual Rev 1 2 7 14 Freescale Semiconductor...
Page 854: ...Time Processor Unit 3 MPC561 MPC563 Reference Manual Rev 1 2 19 24 Freescale Semiconductor...
Page 968: ...Development Support MPC561 MPC563 Reference Manual Rev 1 2 23 54 Freescale Semiconductor...
Page 1144: ...Internal Memory Map MPC561 MPC563 Reference Manual Rev 1 2 B 34 Freescale Semiconductor...
Page 1212: ...TPU3 ROM Functions MPC561 MPC563 Reference Manual Rev 1 2 D 60 Freescale Semiconductor...
Page 1216: ...Memory Access Timing MPC561 MPC563 Reference Manual Rev 1 2 E 4 Freescale Semiconductor...