SPNS254A June 2022 – March 2024 TMS570LC4357-SEP
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
There is no timing dependency between the ramp of the VCCIO and the VCC supply voltage. The power-up sequence starts with the I/O voltage rising above the minimum I/O supply threshold, (for more details, see Table 7-3), core voltage rising above the minimum core supply threshold and the release of power-on reset. The high-frequency oscillator will start up first and its amplitude will grow to an acceptable level. The oscillator start-up time is dependent on the type of oscillator and is provided by the oscillator vendor. The different supplies to the device can be powered up in any order.
The device goes through the following sequential phases during power up.
Oscillator start-up and validity check | 1024 oscillator cycles |
eFuse autoload | 3650 oscillator cycles |
Flash pump power-up | 250 oscillator cycles |
Flash bank power-up | 1460 oscillator cycles |
Total | 6384 oscillator cycles |
The CPU reset is released at the end of the above sequence and fetches the first instruction from address 0x00000000.