UPD75218 NEC, UPD75218 Datasheet - Page 15

• Manufacturer Part Number: UPD75218
• Description: 4-BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

5. PERIPHERAL HARDWARE FUNCTIONS
5.1
The PD75218 has the following three types of I/O port:
• 8 CMOS input pins (PORT0 and PORT1)
• 20 CMOS I/O pins (PORT2, PORT3, PORT4, PORT5, and PORT6)
• 4 P-ch open-drain output pins with high withstand voltage and high current (PORTH)
Total: 32 pins
PORT2
PORT4
PORT5
PORT3
PORT6
PORTH
PORT0
PORT1
Port
PORTS
4-bit input
4-bit
input/output
4-bit output
Function
Always read or test possible irrespective of the dual-function
pin operating mode.
Always read or test possible, P10 and P11 are inputs with the
noise elimination function.
Can be set to the input or output mode in 4-bit units.
Ports 4 and 5 can input/output data in pairs in 8-bit units.
Ports 4 and 5 can directly drive LEDs.
Can be set bit-wise to the input or output mode. Port 6 can
incorporate a pull-down resistor by mask option.
P-ch open-drain output port with high withstand voltage and
high current.
incorporate a pull-down resistor in bit units by mask option.
Table 5-1 Functions of Ports
Can drive an FIP and LED directly.
Operation and feature
Can
Shares the pins with SI, SO, SCK
and INT4.
Shares the pins with INT0 to
INT2 and TI0.
P23 shares the pin with BUZ.
Shares the pins with T10/S15 to
T13/S12.
Remarks
PD75218
15