CHAPTER 2 PIN FUNCTIONS
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2.2.9 P90 through P97 (Port 9)
P90 through P97 constitute an 8-bit I/O port. These pins are also used as FIP controller/driver output pins.
The following operation modes can be specified in 1-bit units.
(1) Port mode
P90 through P97 function as an 8-bit I/O port in this mode.
These pins are P-ch open-drain pins. Pull-down resistors can be connected to these pins of the mask ROM
models by mask option. The
m
PD78F0228 does not have pull-down resistors.
(2) Control mode
In this mode, P90 through P97 function as the output pins of the FIP controller/driver (FIP32 through FIP39).
2.2.10 P100 through P107 (Port 10)
P100 through P107 constitute an 8-bit output port. These pins are also used as FIP controller/driver output pins.
The following operation modes can be specified in 1-bit units.
(1) Port mode
P100 through P107 function as an 8-bit output port in this mode.
These pins are P-ch open-drain pins. Pull-down resistors can be connected to these pins of the mask ROM
models by mask option. The
m
PD78F0228 does not have pull-down resistors.
(2) Control mode
In this mode, P100 through P107 function as the output pins of the FIP controller/driver (FIP40 through FIP47).
2.2.11 FIP0 through FIP15
These are the output pins of the FIP controller/driver.
2.2.12 V
LOAD
This pin connects a pull-down resistor to the FIP controller/driver.
2.2.13 AV
DD
This pin supply an analog voltage to the A/D converter.
Always keep this pin at the same potential as the V
DD1
pin even when the A/D converter is not used.
2.2.14 AV
SS
This is the ground pin of the A/D converter.
Always keep this pin at the same potential as the V
SS1
pin even when the A/D converter is not used.
2.2.15 RESET
This pin inputs an active-low system reset signal.
2.2.16 X1 and X2
These pins connect a crystal resonator for main system clock oscillation.
To supply an external clock, input it to X1, and input a signal reverse to that input to X1, to X2.