Epson S1C88650 Technical Manual page 56

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