HD404829R Datasheet, PDF (48/149 Pages) Renesas Technology Corp – AS Microcomputer Incorporating a LCD controller/Driver Circuit

HD404829R Series
Input/Output
The MCU has 42 input/output pins (D₀–D₉, R0₀–R7₃) and 2 input pins (D₁₀, D₁₁). The features are
described below.
• Ten pins (D₀–D₉) are high-current input/output pins.
• The D₁₀ and D₁₁, and R0₀–R7₃ 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 R2₃/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 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 29, programmable I/O circuits are listed in table 17, and I/O pin
circuit types are shown in table 18.
Table 17 Programmable I/O Circuits
MIS3 (bit 3 of MIS)
0
DCD, DCR
0
1
PDR
0
1
0
1
CMOS buffer PMOS
—
—
—
On
NMOS
—
—
On
—
Pull-up MOS
—
—
—
—
Note: — indicates off status.
1
0
1
0
1
0
1
—
—
—
On
—
—
On
—
—
On
—
On
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