TC11IB Datasheet, PDF (69/108 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller

TC11IB
Power Sequencing
During power-up, the reset pin PORST has to be held active until both power supply
voltages have reached at least their minimum values.
While powering up (rising of the supply voltages from 0V to their regular operating
values), it has to be ensured, that the core power supply V_DD reaches its operating value
first, and then the GPIO power supply V_DDP. During the rising time of the core power
supply it must be ensured that 0 < V_DD - V_DDP < 0.5V.
During power-down, the core and GPIO power supplies V_DD and V_DDP respectively,
have to be switched off completely until all capacitances are discharged to zero, before
the next power-up.
Note: The state of the pins are undefined when only the port voltage V_DDP is switched
on.
Data Sheet
65
V2.3, 2003-11