CHAPTER 4 PORT FUNCTIONS
User’s Manual U15075EJ2V1UD
83
Figure 4-6. Block Diagram of P21 and P26
Internal bus
V
DD
P-ch
P21/BZO90,
P26/TO90
WR
PUB2
RD
WR
PORT
WR
PM
PUB21, PUB26
Output latch
(P21, P26)
PM21, PM26
Alternate
function
Selector
PUB2: Pull-up resistor option register B2
PM:
Port mode register
RD:
Port 2 read signal
WR:
Port 2 write signal