Specifications

Chapter 3 Function Description 19
Initial Configuration
The initial configuration of each port depends on the software or
switch SW2 setting of each port as input or output port, on the setting
of the jumper JP1 to set the hot reset type.
3.3 Interrupt Function
Interrupt Function of the DIO Signals
Two I/O pins (PC0 and PC1) can be used to generate hardware
interrupts. A user can program the interrupt control register (Base + 32)
to select the interrupt sources.
The "Interrupt Control Register" (Base + 32) controls the interrupt
signal source, edge and flag. Table 3-2 shows the bit map of the
interrupt control register. The register is a readable/writable register.
When writing to it, it is used as a control register, and when reading
from it, it is used as a status register.
Bit# D7 D6 D5 D4 D3 D2 D1 D0
X X X X F E M1 M0
Table 3-2: Interrupt control register bit map
M0 and M1: "mode bits" of port 0
E: triggering edge control bits
F: flag bits
X: don’t care