STM705, STM706, STM707, STM708, STM813L

Operation

Doc ID 10520 Rev 9

13/33

3.7

Interfacing to microprocessors with bidirectional reset pins

Microprocessors with bidirectional reset pins can contend with the STM705-708 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 4.7 k

Ω resistor

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

Figure 11.

Interfacing to microprocessors with bidirectional reset I/O

AI08836

STMXXX

RST

GND

4.7 k

VCC

Microprocessor

RST

Buffered reset to other

system components

GND

VCC