LC87F7NC8A Datasheet, PDF (14/28 Pages) ON Semiconductor – 8-bit Microcontroller

LC87F7NC8A
Port Output Types
The table below lists the types of port outputs and the presence/absence of a pull-up resistor.
Data can be read into any input port even if it is in the output mode
Port Name
Option Selected
in Units of
Option Type
Output Type
Pull-up Resistor
P00 to P07
each bit
1
CMOS
Programmable (Note)
2
Nch-open drain
Programmable
P10 to P17
each bit
1
CMOS
Programmable
2
Nch-open drain
Programmable
P30 to P35
each bit
1
CMOS
Programmable
2
Nch-open drain
Programmable
P70
-
No
Nch-open drain
Programmable
P71 to P73
-
No
CMOS
Programmable
P80 to P87
-
No
Nch-open drain
No
S0/PA0 to S47/PF7
-
No
CMOS
Programmable
COM0/PL0 to
-
No
Input only
No
COM3/PL3
V1/PL4 to V3/PL6
-
No
Input only
No
XT1
-
No
Input only
No
XT2
-
No
Output for 32.768kHz crystal oscillator
(Nch-open drain when in general-purpose
No
output mode)
User Option List
Option Name
Option Type
P00 to P07
Mask Version
*1

Flash Version

Option Selected in
Units of
each bit
Port output form
P10 to P17


each bit
P30 to P35


each bit
Program start
-


-
address
*2
*1: Mask option selection - No change possible after the mask is completed.
*2: Program start address of the mask version is 00000H.
LSI
VDD1
Specified Item
CMOS
Nch-open drain
CMOS
Nch-open drain
CMOS
Nch-open drain
00000H
1FF00H
Power
supply
For backup *2
VDD2
VDD3
VSS1 VSS2 VSS3
*1: Connect the IC as shown below to minimize the noise input to the VDD1 pin.
Be sure to electrically short the VSS1, VSS2, and VSS3 pins.
*2: The internal memory is sustained by VDD1. If none of VDD2 and VDD3 are backed up, the high level output at
the ports are unstable in the HOLD backup mode, allowing through current to flow into the input buffer and thus
shortening the backup time.
Make sure that the port outputs are held at the low level in the HOLD backup mode.
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