Specifications
S1C62N82 TECHNICAL HARDWARE EPSON I-27
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Input Ports)
Input Ports (K00–K03, K10)
The S1C62N82 Series have a general-purpose input (4 bits +
1 bit). Each of the input port pins (K00–K03, K10) has an
internal pull-down resistance. The pull-down resistance can
be selected for each bit with the mask option.
Figure 4.3.1 shows the configuration of input port.
4.3
Configuration of
input ports
Fig. 4.3.1
Configuration of input port
Kxx
Mask option
Address
V
DD
Interrupt
request
Data bus
V
SS
Selecting "pull-down resistance enabled" with the mask
option allows input from a push button, key matrix, and so
forth. When "pull-down resistance disabled" is selected, the
port can be used for slide switch input and interfacing with
other LSIs.