LC87F1HC8AUWA-2H Datasheet, PDF (10/27 Pages) ON Semiconductor – 8-bit 1-chip Microcontroller with USB-host controller

LC87F1HC8A
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
P00 to P07
Option selected in
units of
1 bit
Option type
1
CMOS
Output type
Pull-up resistor
Programmable (Note 1)
2
Nch-open drain
No
P10 to P17
P20 to P27
P30 to P34
P70
1 bit
1
CMOS
2
Nch-open drain
-
No
Nch-open drain
Programmable
Programmable
Programmable
P71 to P73
-
No
CMOS
Programmable
PWM0, PWM1
-
No
CMOS
No
UHD+, UHD-
-
No
CMOS
No
XT1
-
No
Input only
No
XT2
-
No
32.768kHz crystal resonator output (N channel open No
drain when in general-purpose output mode)
Note 1: Programmable pull-up resistors for port 0 are controlled in 4 bit units (P00 to 03, P04 to 07).
Power Pin Treatment
Connect the IC as shown below to minimize the noise input to the VDD1 pin. and extend the backup period. Be sure to
electrically short the VSS1, VSS2, and VSS3 pins.
Example 1: When the microcontroller is in the backup state in the HOLD mode, the power to sustain the high level of
output ports is supplied by their backup capacitors.
Power
supply
For backup
LSI
VDD1
VDD2
VDD3
VSS1 VSS2 VSS3
Example 2: The high level output at ports is not sustained and unstable in the HOLD backup mode.
Power
supply
For backup
LSI
VDD1
VDD2
VDD3
VSS1 VSS2 VSS3
No.A0956-10/27