Input Ports (K00-K03, K10-K13 And K20); Configuration Of Input Ports - Epson S1C63358 Technical Manual

4.5 Input Ports (K00–K03, K10–K13 and K20)

4.5.1 Configuration of input ports

The S1C63358 has nine bits general-purpose input ports. Each of the input port terminals (K00–K03, K10–
K13, K20) provides internal pull-up resistor. Pull-up resistor can be selected for each bit with the mask
option.
Figure 4.5.1.1 shows the configuration of input port (K00–K03, K10–K13).
Figure 4.5.1.2 shows the configuration of input port (K20).
K20
Selection of "With pull-up resistor" with the mask option suits input from the push switch, key matrix,
and so forth. When "Gate direct" is selected, the port can be used for slide switch input and interfacing
with other LSIs.
S1C63358 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Input Ports)
Kxx
Fig. 4.5.1.1 Configuration of input port (K00–K03, K10–K13)
Fig. 4.5.1.2 Configuration of input port (K20)
V
DD
Interrupt
request
Address
V
SS
Mask option
Address
V
DD
Key sense
ON/OFF control
Interrupt
request
Address
V
SS
Mask option
EPSON
35