Mask Option - Epson S1C6S3N2 Technical Manual

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Input Ports)

Mask option

I-34
The contents that can be selected with the input port mask
option are as follows:
(1) Internal pull-down resistor can be selected for each of the
five bits of the input ports (K00–K03, K10).
When you have selected "pull-down resistor disabled",
take care that the floating status does not occur for the
input. Select "pull-down resistor enabled" for input ports
that are not being used.
(2) The input interrupt circuit contains a noise rejector for
preventing interrupt occurring through noise. The mask
option enables selection of whether to use the noise
rejector for each separate terminal series.
When "Use" is selected, a maximum delay of 1 ms occurs
from the time interrupt condition is established until the
interrupt factor flag (IK) is set to "1".
EPSON
S1C6S3N2 TECHNICAL HARDWARE