HD404618 Datasheet, PDF (8/91 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

HD404618 Series
Interrupts
INT₀, INT₁: Input external interrupts to the MCU. INT₁ is also used as an external event input for timer B.
INT₀ and INT₁ are multiplexed with R3₂ and R3₃, respectively.
Serial Communications Interface
SCK: Input/output serial clock pin multiplexed with R0₀.
SI: Serial receive data input pin multiplexed with R0₁.
SO: Serial transmit data output pin multiplexed with R0₂.
Timers
TIMO: Outputs a variable-duty square wave. It is multiplexed with R3₁.
LCD Driver/Controller
V₁, V₂, V₃: Power supply pins for the LCD driver. Internal resistors provide the voltage level for each pin.
The voltage condition is V_CC ≥ V₁ ≥ V₂ ≥ V₃ ≥ GND.
COM1–COM4: Common signal output pins for LCD display.
SEG1–SEG32: Segment signal output pins for LCD display.
DTMF Generator
TONER, TONEC, VT_ref: DTMF signal pins. TONER and TONEC transmit signals for row and column,
respectively. VT_ref is a reference voltage for DTMF signals. Apply condition V_CC ≥ VT_ref ≥ GND to VT_ref.
Voltage Comparator
COMP0, COMP1, VC _ref: COMP0 and COMP1 are analog inputs for the voltage comparator. VC_ref is a
reference voltage pin that inputs the threshold voltage of the analog input pin.
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