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CHAPTER 4 PORT FUNCTIONS
User’s Manual U19780EJ2V0UD
107
Figure 4-18. Block Diagram of P80
P80/ANI8/AMP2-
RD
WR
PORT
WR
PM
PM80
PM8
P8
Internal bus
Selector
Output latch
(P80)
A/D converter
Operational amplifier (-) input
Figure 4-19. Block Diagram of P81
P81/ANI9/AMP2OUT
RD
WR
PORT
WR
PM
PM81
PM8
P8
Internal bus
Selector
Output latch
(P81)
A/D converter
Operational amplifier output
P8:
Port register 8
PM8:
Port mode register 8
RD: Read
signal
WR
××
: Write
signal