SAB80C515A-5 Datasheet, PDF (34/108 Pages) Siemens Semiconductor Group – 8-Bit CMOS Single-Chip Microcontroller Family

On-Chip Peripheral Components
5 On-Chip Peripheral Components
Digital I/O Port Circuitry
To realize the Hardware Power Down Mode with floating Port pins in the SAB 80C515A/83C515A-5
the standard port structure used in the 8051 Family is modified (figure 5-1).
The FETs p4, p5 and n2 are added. During Hardware Power Down this FETs disconnect the port
pins from internal logic.
Figure 5-1
Port Structure
Semiconductor Group
5-1