UPD78F9418A NEC, UPD78F9418A Datasheet - Page 37

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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2.2.3 P40 to P47 (Port 4)
signal detection pins.
2.2.4 P50 to P53 (Port 5)
that pull-up resistors be used, via a mask option.
2.2.5 P60 to P66 (Port 6)
function as A/D converter analog input pins and comparator input pins.
Caution When using P20 to P27 as serial interface pins, the I/O mode and output latch must be set
These pins constitute an 8-bit I/O port. In addition to I/O port pins, these pins can also function as key return
The following operation modes can be specified in 1-bit units.
(1)
(2)
These pins constitute a 4-bit N-channel open-drain I/O port. In the mask ROM version, it is possible to specify
These pins constitute a 7-bit input-only port. In addition to general-purpose input port pins, these pins can also
(1)
(2)
(i)
(j)
Port mode
In this mode, P40 to P47 function as an 8-bit I/O port. These pins can be set to input or output mode in 1-bit
units by using port mode register 4 (PM4). When used as input port pins, an on-chip pull-up resistor can be
used by setting pull-up resistor option register 0 (PU0).
Control mode
In this mode, the pins function as key return signal detection pins (KR0 to KR5).
Port mode
In this port mode, P60 to P66 function as a 7-bit input-only port.
Control mode
In this mode, the pins can be used as A/D converter analog inputs and comparator inputs.
(a)
(b)
(c)
INTP0 to INTP3
These are external interrupt input pins for which a valid edge (rising edge, falling edge, or both rising
and falling edges) can be specified.
CMPTOUT0
This is the comparator output pin.
according to the function to be used. For details of the setting, refer to Table 13-2.
ANI0 to ANI6
These are the A/D converter analog input pins.
CMPIN0
This is the comparator input pin.
CMPREF0
This is the comparator reference voltage input pin.
CHAPTER 2 PIN FUNCTIONS
User’s Manual U13952EJ3V0UD
37