HD404019R Datasheet, PDF (8/65 Pages) Renesas Technology Corp – CMOS 4-bit single-chip microcomputers

HD404019R Series
Pin Functions
Power Supply
V_CC: Apply the power supply voltage to this pin.
GND: Connect to ground.
V_disp: Power supply pin (multiplexed with RA₁) for high-voltage I/O pins with a maximum voltage of 40 V
(V_CC – 40 V). For details, see the Input/Output section.
TEST: For test purposes only. Connect it to V_CC.
RESET: Resets the MCU. For details, see the Reset section.
Oscillators
OSC₁, OSC₂: OSC₁ and OSC₂ can be connected to a crystal resonator, ceramic resonator or an external
oscillator circuit. For details, see the Internal Oscillator Circuit section.
Ports
D₀ to D₁₅ (D Port): An input/output port addressed by bits. These 16 pins are all input/output pins. D₀ to D₃
are standard pins and D₄ to D₁₅ are high-voltage pins. The circuit type for each pin can be selected using a
mask option. For details, see the Input/Output section.
R0 to RA₁ (R Ports): R0 to R9 are 4-bit I/O ports. Only RA is a 2-bit port. R9 and RA are input ports, and
R0 to R8 are I/O ports. R0, R1, R2, and RA are high-voltage ports, and R3 to R9 are standard ports. Each
pin has a mask option which selects its circuit type. The pins R3₂, R3₃, R4₀, R4₁, and R4₂ are multiplexed
with INT₀, INT₁, SCK, SI, and SO, respectively. For details, see the Input/Output section.
Interrupts
INT₀, INT₁: External interrupts for the MCU. INT₁ can be used as an external event input pin for timer B.
INT₀ and INT₁ are multiplexed with R3₂ and R3₃, respectively. For details, see the Interrupt section.
Serial Interface
SCK, SI, SO: The transmit clock I/O pin (SCK), serial data input pin (SI), and serial data output pin (SO)
are used for serial interface. SCK, SI, and SO are multiplexed with R4₀, R4₁, and R4₂, respectively. For
details, see the Serial Interface section.
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