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48 EPSON S1C88650 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Input Ports)
Table 5.5.5.1(b) Input port control bits
SR R/WAddress Bit Name Function Comment10
00FF20 D7
D6
D5
D4
D3
D2
D1
D0
PK01
PK00
PSIF1
PSIF0
–
–
PTM1
PTM0
Constantly "0" when
being read
0
0
–
–
0
R/W
R/W
R/W
–
–
–
–
K00–K07 interrupt priority register
Serial interface interrupt priority register
–
–
Clock timer interrupt priority register
PK01
PSIF1
1
1
0
0
Priority
level
PK00
PSIF0
1
0
1
0
Level 3
Level 2
Level 1
Level 0
PTM1
1
1
0
0
Priority level
PTM0
1
0
1
0
Level 3
Level 2
Level 1
Level 0
D7
D6
D5
D4
D3
D2
D1
D0
00FF24 EK07
EK06
EK05
EK04
EK03
EK02
EK01
EK00
K07 interrupt enable
K06 interrupt enable
K05 interrupt enable
K04 interrupt enable
K03 interrupt enable
K02 interrupt enable
K01 interrupt enable
K00 interrupt enable
0
Interrupt
enable
Interrupt
disable
R/W
D7
D6
D5
D4
D3
D2
D1
D0
00FF28 FK07
FK06
FK05
FK04
FK03
FK02
FK01
FK00
K07 interrupt factor flag
K06 interrupt factor flag
K05 interrupt factor flag
K04 interrupt factor flag
K03 interrupt factor flag
K02 interrupt factor flag
K01 interrupt factor flag
K00 interrupt factor flag
0
(R)
Interrupt
factor is
generated
(W)
Reset
(R)
No interrupt
factor is
generated
(W)
No operation
R/W
K00D–K07D: 00FF54H
Input data of input port terminal K0x can be read
out.
When "1" is read: HIGH level
When "0" is read: LOW level
Writing: Invalid
The terminal voltage of each of the input port K00–
K07 can be directly read out as either a "1" for
HIGH (V
DD) level or a "0" for LOW (VSS) level.
This bit is exclusively for readout and are not
usable for write operations.
PULK00–PULK07: 00FF56H
Controls the input pull-up resistor.
When "1" is written: Pull-up ON
When "0" is written: Pull-up OFF
Reading: Valid
PULK0x is the pull-up control register
corresponding to the input port K0x that turns the
pull-up resistor built into the input port ON and
OFF.
When "Gate direct" is selected by mask option, the
corresponding pull-up control register is
disconnected from the input line, so it can be used
as a general-purpose register.
When "1" is written to PULK0x, the corresponding
input port K0x is pulled up to high. When "0" is
written, the input port is not pulled up.
At initial reset, this register is set to "1" (Pull-up
ON).