STM706T/S/R, STM706P, STM708T/S/R

Operation

Doc ID 10518 Rev 12

13/32

3.7

Interfacing to microprocessors with bi-directional reset pins

Microprocessors with bi-directional reset pins can contend with the STM70x reset output.

For example, if the reset output is driven high and the micro wants to pull it low, signal

contention will result. To prevent this from occurring, connect a 4.7k

Ω resistor between the

reset output and the micro's reset I/O as in Figure 11.

Figure 11.

Interfacing to microprocessors with bi-directional reset I/O

AI08845

STM70x

RST

GND

4.7 k

Ω

VCC

Microprocessor

RST

Buffered reset to other

system components

GND

VCC