Input Interrupt; Port Input Interrupt - Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Technical Manual

III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS

Input Interrupt

The input ports and the I/O ports support eight system of port input interrupts and two systems of key input
interrupts.

Port Input Interrupt

The port input interrupt circuit has eight interrupt systems (FPT7–FPT0) and a port can be selected for generating
each interrupt factor.
The interrupt condition can also be selected from between input signal edge and input signal level.
Figure 9.3 shows the configuration of the port input interrupt circuit.
K67
P33
P07
P27
Input port selection
Address
Address
FPT7
FPT6
FPT5
FPT4
Selecting input pins
The interrupt factors allows selection of an input pin from the four predefined pins independently.
Table 9.5 shows the control bits and the selectable pins for each factor.
Interrupt
factor
FPT7 SPT7[1:0] (D[7:6])/Port input interrupt select register 2 (0x402C7)
FPT6 SPT6[1:0] (D[5:4])/Port input interrupt select register 2 (0x402C7)
FPT5 SPT5[1:0] (D[3:2])/Port input interrupt select register 2 (0x402C7)
FPT4 SPT4[1:0] (D[1:0])/Port input interrupt select register 2 (0x402C7)
FPT3 SPT3[1:0] (D[7:6])/Port input interrupt select register 1 (0x402C6)
FPT2 SPT2[1:0] (D[5:4])/Port input interrupt select register 1 (0x402C6)
FPT1 SPT1[1:0] (D[3:2])/Port input interrupt select register 1 (0x402C6)
FPT0 SPT0[1:0] (D[1:0])/Port input interrupt select register 1 (0x402C6)
B-III-9-12
SPT7
Input polarity
selection SPPT7
Edge/level
selection SEPT7
FPT3
FPT2
FPT1
FPT0
Figure 9.3 Configuration of Port Input Interrupt Circuit
Table 9.5 Selecting Pins for Port Input Interrupts
Control bit
Interrupt signal
generation
EPSON
Interrupt
request
FPT7
FPT6
FPT5
FPT4
FPT3
FPT2
FPT1
FPT0
SPT settings
11 10 01
P27 P07 P33
P26 P06 P32
P25 P05 P31
P24 P04 K54
P23 P03 K53
P22 P02 K52
P21 P01 K51
P20 P00 K50
S1C33L03 FUNCTION PART
00
K67
K66
K65
K64
K63
K62
K61
K60