LC87F7LC8A Datasheet, PDF (11/25 Pages) Sanyo Semicon Device – CMOS IC FROM 128K byte, RAM 4096 byte on-chip 8-bit 1-chip Microcontroller

LC87F7LC8A
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
No
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 for 32.768kHz crystal
No
oscillator (Input only)
XT2
-
No
Output for 32.768kHz crystal oscillator
(Nch-open drain when in general-purpose
No
output mode)
Note 1: Programmable pull-up resistors for port 0 are controlled in 4 bit units (P00 to 03, P04 to 07).
*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.
Power
supply
For backup *2
LSI
VDD1
VDD2
VDD3
VSS1 VSS2 VSS3
*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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