5. PERIPHERAL HARDWARE FUNCTIONS
I/O ports have the following three functions.
CMOS input (PORT0, 1)
CMOS input/output (PORT2, 3, 4, 5, 6)
P-ch open-drain, high-voltage, high-current output (PORTH) : 4
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 bit-wise to the input or output mode. Port 6 can
incorporate a pull-down resistor as a mask option.
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.
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 Port Functions
Operation and Feature
Shares the pins with SI, SO, SCK
Shares the pins with INT0 to INT
2 and TI0.
P23 shares the pin with BUZ.
Shares the pins with T10/S15 to