TC1920 Datasheet, PDF (42/78 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC1920
Preliminary
Power-Up Sequence
During Power-Up reset pin PORST has to be held active until both power supply
voltages have reached at least their minimum values.
During the Power-Up time (rising of the supply voltages from 0 to their regular operating
values) it has to be ensured, that the core V_DD power supply reaches its operating value
first, and then the GPIO V_DDP power supply. During the rising time of the core voltage it
must be ensured that 0< V_DD-V_DDP <0.5 V.
During power-down, the core and GPIO power supplies V_DD and V_DDP respectively,
have to be switched off until all capacitances are discharged to zero, before the next
power-up.
Note: The states of the pins are undefined when only the port voltage V_DDP is on.
Data Sheet
38
V 1.3, 2003-10