UPD78F9234MC-5A4-A Datasheet, PDF (61/419 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

WRPU
RD
CHAPTER 4 PORT FUNCTIONS
Figure 4-6. Block Diagram of P32 and P33
PU3
PU32, PU33
VDD
P-ch
WRPORT
WRPM
P3
Output latch
(P32, P33)
PM3
PM32, PM33
P32, P33
PU3: Pull-up resistor option register 3
P3: Port register 3
PM3: Port mode register 3
RD: Read signal
WR××: Write signal
Figure 4-7. Block Diagram of P34
RD
Reset
Option
byte
P34/RESET
RD: Read signal
Caution Because the P34 pin functions alternately as the RESET pin, if it is used as an input port pin, the
function to input an external reset signal to the RESET pin cannot be used. The function of the
port is selected by the option byte. For details, refer to CHAPTER 18 OPTION BYTE.
User’s Manual U17446EJ5V0UD
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