NEC PD78214 - Manual (Page 108)

79
Chapter 5 Port Functions
5
Fig. 5-25 Connection of Pull-Up Resistors (Port 4)
5.5.5 Driving LEDs Directly
For port 4, the low level side of the output buffer has an enhanced driving capacity so that it can drive an LED directly
on an active-low signal. Fig. 5-26 is an example of such an output buffer.
Fig. 5-26 Example of Driving an LED Directly
PD78214
µ
V
DD
P4n
(n = 0 to 7)
Internal bus
V
DD
P40
P41
P42
P46
P47
Input buffer
Pull-up resistor option register (PUO)
••• ••• •••
PUO4
•••