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CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U14581EJ3V0UM00
4.2.8 Port 8
Port 8 is a 7-bit input/output port with output latch. P81 to P87 pins can specify the input mode/output mode in
1-bit units with the port mode register 8 (PM8).
Alternate functions also include segment signal output of the LCD controller/driver.
Segment output and input/output port can be switched by setting the LCD display control register (LCDC).
RESET input sets port 8 to input mode.
Figure 4-9 shows block diagram of port 8.
Figure 4-9. P81 to P87 Block Diagram
P81/S19 to P87/S13
WR
PORT
WR
PM
Output latch
(P81 to P87)
PM81 to PM87
Segment output
function
RD
Selector
Internal bus
PM: Port mode register
RD: Port 8 read signal
WR: Port 8 write signal
Содержание mPD780852 Series
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