Port 13 - NEC 78K0S/KB1+ User Manual

RD
WR
PORT
WR
PM
PM12: Port mode register 12
P12: Port register 12
RD: Read signal
WR××: Write signal
4.2.6

Port 13

This is a 1-bit output-only port.
Figure 4-14 shows the block diagram of port 13.
RD
WR
PORT
P13: Port register 13
RD: Read signal
WR××: Write signal
Remark When a reset is input, P130 outputs a low level. If P130 outputs a high level immediately after
reset is released, the output signal of P130 can be used as a dummy CPU reset signal.
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CHAPTER 4 PORT FUNCTIONS
Figure 4-13. Block Diagram of P121 and P122
P12
Output latch
(P121, P122)
PM12
PM121, PM122
Figure 4-14. Block Diagram of P130
P13
Output latch
(P130)
User's Manual U17446EJ3V1UD
P121/X1,
P122/X2
P130