MSM6352 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM6352

Built-in DTMF Generator 4-Bit Microcontroller

Oki Electric Industry 

¡ Semiconductor

MSM6352

Input Port (I1-4)

Input only port that consists of 4 bits (I1, I2, I3, I4). The port status is determined by the input

instruction. Each input pin is pulled down to VSS (low level) through a transistor. The resistors

are connected only when the port status is determined or a low level signal is input.

Since the input current is limited, this port can be fixed at high level (VDD) for use.

I1

BUS 0

I2

VSS

BUS 1

I3

VSS

BUS 2

I4

VSS

VSS

BUS 3

Input instruction (IN 3, AP)

Figure 3. Input port (I1-I4) Configuration

HS Input Pin

HS 1-bit input pin, whose status can be fetched by the input instruction. It is pulled up to high

level (VDD) by a resistor and used as a hook switch input pin.

VDD

HS

BUS 0

Input instruction (IN 2, AP)

Figure 4. Configuration of HS Input Pin

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