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I-26 EPSON S1C62740 TECHNICAL HARDWARE

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Input Ports)

Input Ports (K00–K03, K10)4.4

Configuration of

input ports

The S1C62740 has five bits general-purpose input ports. Each of

the input port terminals (K00–K03, K10) provides internal pull up

resistor. Pull up resistor can be selected for each bit with the mask

option.

Figure 4.4.1 shows the configuration of input port.

Fig. 4.4.1

Configuration of input port

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.

Further, the input port terminal K10 is used as the input terminal

for the programmable timer/event counter and the interrupt port

for the SLEEP mode cancellation. (See Section 4.10, "Programma-

ble Timer", and Section 4.15, "Interrupt and HALT/SLEEP" for

details.)

Kxx

Mask

option

Address

Interrupt

request

Data bus

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 248 249

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Epson S1C6200A Dokumentacja Strona 38