UPD75208 NEC, UPD75208 Datasheet - Page 14

• Manufacturer Part Number: UPD75208
• Description: 4-BIT SINGLE-CHIP MICROCOMPUTER
• Manufacturer: NEC

14
5. PERIPHERAL HARDWARE FUNCTIONS
5.1
Port Name
The PD75208 has the following three types of I/O port:
• 8 CMOS input ports
• 20 CMOS I/O ports
• 4 P-ch open-drain high-voltage, large-current output ports
Total: 32 ports
PORT2
PORT4
PORT5
PORT3
PORT6
PORTH
PORT0
PORT1
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 eliminate 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 as a mask option.
P-ch open-drain high-voltage, high-current output port. Can
drive an FIP and LED directly. Can incorporate a pull-down
resistor bit-wise as a mask option.
Table 5-1 Functions of Ports
Operation and Feature
Shares the pins with SI, SO, SCK
and INT4.
Shares the pins with INT0 to 2
and TI0.
P23 shares the pin with BUZ.
Shares the pins with T10 to T13.
Remarks
PD75208