III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS
B-III-9-12
EPSON
S1C33L03 FUNCTION PART
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.
FPT0
FPT1
FPT2
Internal data bus
FPT3
FPT4
FPT5
K67
P33
P07
P27
Input polarity
selection SPPT7
Edge/level
selection SEPT7
Address
Address
FPT6
FPT7
FPT7
FPT6
FPT5
FPT4
FPT3
FPT2
FPT1
FPT0
Input port selection
SPT7
Interrupt
request
Interrupt signal
generation
Figure 9.3 Configuration of Port Input Interrupt Circuit
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.
Table 9.5 Selecting Pins for Port Input Interrupts
Interrupt
SPT settings
factor
Control bit
11
10
01
00
FPT7
SPT7[1:0] (D[7:6])/Port input interrupt select register 2 (0x402C7)
P27
P07
P33
K67
FPT6
SPT6[1:0] (D[5:4])/Port input interrupt select register 2 (0x402C7)
P26
P06
P32
K66
FPT5
SPT5[1:0] (D[3:2])/Port input interrupt select register 2 (0x402C7)
P25
P05
P31
K65
FPT4
SPT4[1:0] (D[1:0])/Port input interrupt select register 2 (0x402C7)
P24
P04
K54
K64
FPT3
SPT3[1:0] (D[7:6])/Port input interrupt select register 1 (0x402C6)
P23
P03
K53
K63
FPT2
SPT2[1:0] (D[5:4])/Port input interrupt select register 1 (0x402C6)
P22
P02
K52
K62
FPT1
SPT1[1:0] (D[3:2])/Port input interrupt select register 1 (0x402C6)
P21
P01
K51
K61
FPT0
SPT0[1:0] (D[1:0])/Port input interrupt select register 1 (0x402C6)
P20
P00
K50
K60
Summary of Contents for CMOS 32-Bit Single Chip Microcomputer S1C33L03
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Page 163: ...S1C33L03 FUNCTION PART II CORE BLOCK ...
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