LC875032A Datasheet, PDF (11/25 Pages) Sanyo Semicon Device – 8-Bit Single Chip Microcontroller with 32/24/16K-Byte EPROM and 640-Byte RAM On Chip

LC875032A/24A/16A
Port Output Configuration
Output configuration and pull-up resistor options are shown in the following table.
Input is possible even when port is set to output mode.
Terminal
Option
applies to:
Option
Output Format
Pull-up resistor
P00-P07
1 bit units
1
CMOS
Programmable (Note 1)
2
Nch-open drain
None
P10-P17
each bit
1
CMOS
Programmable
P20-P27
2
Nch-open drain
Programmable
PA2-PA5
each bit
1
CMOS
Programmable
PB0-PB7(*)
PC0-PC7
2
Nch-open drain
Programmable
P70
-
None
Nch-open drain
Programmable
P71-P73
-
None
CMOS
Programmable
P80-P82
-
None
Nch-open drain
None
PWM0,
-
None
CMOS
None
PWM1
XT1
-
None
Input only
None
XT2
-
None Output for 32.768kHz crystal oscillation
None
Note 1 Programmable pull-up resisters of Port 0 can be attatched in nibble units (P00-03, P04-07).
(*) When in parallel interface mode, PB0-PB7 output format is CMOS, regardless of any selected option.
Note: Connect as follows to reduce noise on VDD and increase the back-up time.
VSS1, VSS2 and VSS3 must be connected together and grounded.
Example 1 : In hold mode, during backup, port output ‘H’ level is supplied from the back-up capacitor.
Power
Supply
LSI
VDD1
Back-up capacitor
VDD2
VDD3
VSS1 VSS2 VSS3
Example 2 : During backup in hold mode output is not held high and its value in unsettled.
Power
Supply
Back-up capacitor
LSI
VDD1
VDD2
VDD3
VSS1 VSS2 VSS3
No.6713-11/25