HD404339 Datasheet, PDF (32/80 Pages) Hitachi Semiconductor – 4-bit HMCS400-Series microcomputer with large-capacity memory

HD404339 Series
I/O Ports
The MCU has 53 input/output pins (D₀–D₁₃, R0₀–R9₃) and one input-only pin (RA₁).
• The 30 pins consisting of ports D₀–D₁₃, R1, R2, R8, and R9 are all high-voltage I/O pins. RA₁ is a high-
voltage input-only pin. The high-voltage pins can be equipped with or without pull-down resistance, as
selected by the mask option.
• All standard voltage output pins are CMOS output pins. However, the R0₂/SO pin can be programmed
for NMOS open-drain output.
• In stop mode, input/output pins go to the high-impedance state.
• All standard voltage input/output pins have pull-up MOS built in, which can be individually turned on
or off by software (Table 5).
Pull-up MOS on/off settings can be made independently of settings as on-chip supporting module pins.
Table 5 Control of Standard I/O Pins by Program
MIS3 (bit 3 of MIS)
DCR
PDR
CMOS buffer PMOS
NMOS
Pull-up MOS
Note: — indicates off.
0
1
0
1
0
1
0
1
0
1
0
1
0
1
—
—
—
On
—
—
—
On
—
—
On
—
—
—
On
—
—
—
—
—
—
On
—
On
30