46
Chapter 2
Pin Functions
Preliminary User’s Manual U15839EE1V0UM00
(7)
P70 to P77 (Port 7), P80 to P83 (Port 8) … Input
Port 7 is an 8-bit input-only port in which all pins are fixed as input pins. Port 8 is a 4-bit input-only
port. P70 to P77 and P80 to P83 can function as input ports and as analog input pins for the A/D
converter in control mode. However, they cannot be switched between these input port and analog
input pin.
(a) Port mode
P70 to P77 and P80 to P83 are input-only pins.
(b) Control mode
P70 to P77 also function as pins ANI0 to ANI7 and P80 to P83 also function as ANI8 to ANI11, but
these alternate functions are not switchable.
(c) ANI0 to ANI11 (Analog Input 0 to 11)
These are the analog input pins for the A/D converter. Connect a capacitor between AV
DD
and
AV
SS
to prevent noise-related operation faults. Also, do not apply voltage that is outside the range
for AV
DD
and AV
SS
to pins that are being used as inputs for the A/D converter. If it is possible for
noise above the AV
DD
range or below the AV
SS
to enter, clamp these pins using a diode that has a
small V
F
value.
(8)
P90 to P97 (Port 9) … Input/Output
Port 9 is an 8-bit input/output port in which input or output can be set in 1-bit units.
An operation mode control register is not available for port 9, since no port pin of port 9 is shared
with peripheral input/output ports.
(a) Port mode
P90 to P97 can be set to input or output in 1-bit units using the port 9 mode register (PM9).
Содержание mPD703128
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