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5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Serial Interface)
Address Bit
Name
00FF20 D7
PK01
D6
PK00
D5
PSIF1
D4
PSIF0
D3
–
D2
–
D1
PTM1
D0
PTM0
00FF23
D7
–
D6
–
D5
–
D4
–
D3
–
D2
ESERR
D1
ESREC
D0
ESTRA
00FF27 D7
–
D6
–
D5
–
D4
–
D3
–
D2
FSERR
D1
FSREC
D0
FSTRA
ESIF: 00FF48H•D0
Sets the serial interface terminals (P10–P13).
When "1" is written: Serial input/output terminal
When "0" is written: I/O port terminal
Reading:
The ESIF is the serial interface enable register and
P10–P13 terminals become serial input/output
_________ _________
terminals (SIN, SOUT, SCLK, SRDY) when "1" is
written, and they become I/O port terminals when
"0" is written.
Also, see Table 5.8.3.2 for the terminal settings
according to the transfer modes.
At initial reset, ESIF is set to "0" (I/O port).
76
Table 5.8.9.1(b) Serial interface control bits
Function
K00–K07 interrupt priority register
Serial interface interrupt priority register
–
–
Clock timer interrupt priority register
–
–
–
–
–
Serial I/F (error) interrupt enable register
Serial I/F (receiving) interrupt enable register
Serial I/F (transmitting) interrupt enable register
–
–
–
–
–
Serial I/F (error) interrupt factor flag
Serial I/F (receiving) interrupt factor flag
Serial I/F (transmitting) interrupt factor flag
Valid
1
PK01
PK00
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)
Generated
No generated
(W)
Reset
No operation
SMD0, SMD1: 00FF48H•D1, D2
Set the transfer modes according to Table 5.8.9.2.
Table 5.8.9.2 Transfer mode settings
SMD1
SMD0
1
1
1
0
0
1
0
0
SMD0 and SMD1 can also read out.
At initial reset, this register is set to "0" (clock
synchronous master mode).
EPSON
0
SR R/W
Comment
Priority
0
R/W
level
0
R/W
–
–
Constantly "0" when
–
–
being read
0
R/W
–
–
Constantly "0" when
–
–
being read
–
–
–
–
–
–
0
R/W
–
–
Constantly "0" when
–
being read
–
–
–
–
–
–
–
(R)
0
R/W
(W)
Mode
Asynchronous 8-bit
Asynchronous 7-bit
Clock synchronous slave
Clock synchronous master
S1C88650 TECHNICAL MANUAL
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