HD404356 Datasheet, PDF (32/100 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer

HD404358 Series
Input/Output
The MCU has 33 input/output pins (D₀–D₈, R0–R4, R8) and an input pin (RA₁). The features are described
below.
• Four pins (R2₀–R2₃) are high-current (15 mA max) input/output with intermediate voltage NMOS open
drain pins.
• The D₀–D₄, R0, R3–R4 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 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 19, programmable I/O circuits are listed in table 21, and I/O pin
circuit types are shown in table 22.
Table 21 Programmable I/O Circuits
MIS3 (bit 3 of MIS)
0
1
DCD, DCR
0
1
0
1
PDR
0
1
0
1
0
1
0
1
CMOS buffer
PMOS
—
—
—
On
—
—
—
On
NMOS
—
—
On
—
—
—
On
—
Pull-up MOS
—
—
—
—
—
On
—
On
Note: — indicates off status.
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