66-MHz Electrical Characteristics
MPC561/MPC563 Reference Manual, Rev. 1.2
Freescale Semiconductor
G-17
Figure G-7. Option B Power-Down Sequence Without Keep-Alive Supply
Figure G-8. Option B Power-Down Sequence with Keep-Alive Supply
G.10 Issues Regarding Power Sequence
G.10.1
Application of PORESET or HRESET
When V
DDH
is rising and V
DDL
is at 0.0 V, as V
DDH
reaches 1.6 V, all 5 V drivers are tristated. Before
V
DDH
reaches 1.6V, all 5 V outputs are unknown. If V
DDL
is rising and V
DDH
is at least 3.1V greater than
V
DDL
, then the 5 V drivers can come out of tristate when V
DDL
reaches 1.1V, and the 2.6 V drivers can
start driving when V
DDL
reaches 0.5 V. For these reasons, the PORESET or HRESET signal must be
asserted during power-up before V
DDL
is above 0.5 V.
If the PORESET or HRESET signal is not asserted before this condition, there is a possibility of disturbing
the programmed state of the flash. In addition, the state of the pads are indeterminant until PORESET or
HRESET propagates through the device to initialize all circuitry.
V
DDH
V
DDL
Ramp down rates may
differ with load.
0.5-V lag
V
DDH
cannot lead V
DDL
by more than 0.5V
V
DDH
≤
5.25V
V
DDH
V
DDL
Ramp down rates may
differ with load.
0.5-V lag
V
DDH
cannot lead V
DDL
by more than 0.5V
V
DDKAP
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...