UPD784938 Datasheet, PDF (139/733 Pages) NEC – 16-Bit Single-Chip Microcontrollers

CHAPTER 6 PORT FUNCTIONS
6.4.1 Hardware configuration
The port 2 hardware configuration is shown in Figure 6-21.
Figure 6-21. Block Diagram of P20 to P24, P26 and P27 (Port 2)
WRPUOL
RDPUOL
Pull-up resistor option register L
PUOL2
Note
VDD
RDP2
Internal
bus
Various interrupt
RDP2 ^{control signals}
Edge
detection
circuit
P2n
n = 0 to 4, 6
VDD
P27
SI0 input
3-wire serial
I/O mode 0
Note P20 and P21 do not have the circuitry enclosed by the broken lines.
Preliminary User’s Manual U13987EJ1V0UM00
139