Datasheet

CHAPTER 4 PORT FUNCTIONS
User’s Manual U18172EJ3V0UD
61
Figure 4-5. Block Diagram of P20 and P21 ( μ PD78F950x)
P20/TOH1,
P21/INTP0
RD
WR PM
PM20, PM21
PM2
WR PORT
WR PU
PU20, PU21
P-ch
PU2
Alternate
function
Alternate
function
Selector
Output latch
(P20, P21)
Internal bus
P2
V DD
P2: Port register 2
PU2: Pull-up resistor option register 2
PM2: Port mode register 2
RD: Read signal
WR××: Write signal
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