CHAPTER 4 PORT FUNCTIONS
User’s Manual U17446EJ3V1UD
56
Figure 4-6. Block Diagram of P32 and P33
P32, P33
WR
PU
RD
WR
PORT
WR
PM
PU32, PU33
Output latch
(P32, P33)
PM32, PM33
V
DD
P-ch
PM3
P3
PU3
Selector
Internal bus
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
P34/RESET
Option
byte
Reset
Internal bus
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.
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Содержание 78K0S/KB1+
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