Rainbow Electronics W79E8213R - Manual (Page 74)

Preliminary W79E8213/W79E8213R Data Sheet
Publication Release Date: July 11, 2008
- 74 - Revision A2
The push-pull output mode has two strong pull-up and pull-down structure that support large source
and sink current output. It removes “weak” pull-up and “very weak” pull-up resister and remains
“strong pull-up resister on quasi-bidirectional output mode. The “strong” pull-up is always turns on
when port latch is logic “1” to support source current. The push-pull port configuration is shown in
below Figure.
Figure 18-3: Push-Pull Output
18.4 Input Only Configuration
By configure this mode, the ports are only digital input and disable digital output. The W79E8213
series can select input pin to Schmitt trigger or TTL level input by PxM1.y and PxM2.y registers.