HD404369 Datasheet, PDF (45/117 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404369 Series
Input/Output
The MCU has 53 input/output pins (D₀–D₁₃, R0–R9) and an input pin (RA₁). The features are described
below.
• Eight pins (R1–R2) are high-current (15 mA max) input/output with intermediate voltage NMOS open
drain pins.
• The D₀–D₄, R0, R3–R5 input/output pins are multiplexed with peripheral function pins such as for the
timers or serial interface. For these pins, the peripheral function setting is done prior to the D or R port
setting. Therefore, when a peripheral function is selected for a pin, the pin function and input/output
selection are automatically switched according to the setting.
• Input or output selection for input/output pins and port or peripheral function selection for multiplexed
pins are set by software.
• Peripheral function output pins are CMOS output pins. Only the R0₂/SO pin can be set to NMOS open-
drain output by software.
• In stop mode, the MCU is reset, and therefore peripheral function selection is cancelled. Input/output
pins are in high-impedance state.
• Each input/output pin except for R1 and R2 has a built-in pull-up MOS, which can be individually
turned on or off by software.
I/O buffer configuration is shown in figure 26, programmable I/O circuits are listed in table 21, and I/O pin
circuit types are shown in table 22.
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