UPD784938 Datasheet, PDF (144/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 6 PORT FUNCTIONS
6.5.1 Hardware configuration
The port 3 hardware configuration is shown in Figures 6-26 to 6-29.
Figure 6-26. P30 (Port 3) Block Diagram
WRPUOL
RDPUOL
WRPM3
RDPM3
Port 3 mode register
PM30
Pull-up resistor option register L
PUOL3
VDD
WRPMC3
RDPMC3
Port 3 mode control register
PMC30
Internal
bus
WRP3
Output latch
P30
P30
RDP3
SI1, RxD input
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Preliminary User’s Manual U13987EJ1V0UM00