III PERIPHERAL BLOCK: INPUT/OUTPUT PORTS
S1C33210 FUNCTION PART
EPSON
B-III-9-11
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
CP3
P33
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
Control bit
SPT settings
factor
11
10
01
00
FPT7
SPT7[1:0] (D[7:6])/Port input interrupt select register 2 (0x402C7)
P27
–
P33
CP3
FPT6
SPT6[1:0] (D[5:4])/Port input interrupt select register 2 (0x402C7)
P26
–
P32
CP2
FPT5
SPT5[1:0] (D[3:2])/Port input interrupt select register 2 (0x402C7)
P25
P05
P31
CP1
FPT4
SPT4[1:0] (D[1:0])/Port input interrupt select register 2 (0x402C7)
P24
P04
–
CP0
FPT3
SPT3[1:0] (D[7:6])/Port input interrupt select register 1 (0x402C6)
P23
P03
CP4
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 S1C33210
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Page 139: ...S1C33210 FUNCTION PART II CORE BLOCK ...
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