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S1C88650 TECHNICAL MANUAL EPSON 27
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (I/O Memory Map)
Table 5.1.1(j) I/O Memory map (00FF48H–00FF4BH)
SR R/WAddress Bit Name Function Comment10
00FF48 D7
D6
D5
D4
D3
D2
D1
D0
–
EPR
PMD
SCS1
SCS0
SMD1
SMD0
ESIF
––
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
– –
SCS1
1
1
0
0
SCS0
1
0
1
0
Clock source
Programmable timer
fOSC3 / 4
fOSC3 / 8
fOSC3 / 16
SMD1
1
1
0
0
SMD0
1
0
1
0
Mode
Asynchronous 8-bit
Asynchronous 7-bit
Clock synchronous slave
Clock synchronous master
Parity enable register
Parity mode selection
Clock source selection
Serial I/F mode selection
Serial I/F enable register
With parity
Odd
Serial I/F
Non parity
Even
I/O port
"0" when being read
Only for
asynchronous mode
In the clock synchro-
nous slave mode,
external clock is
selected.
00FF49 D7
D6
D5
D4
D3
D2
D1
D0
–
FER
PER
OER
RXTRG
RXEN
TXTRG
TXEN
– "0" when being read
Only for
asynchronous mode
–
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
– –
R
W
R
W
R
W
R
W
R
W
Serial I/F framing error flag
Serial I/F parity error flag
Serial I/F overrun error flag
Serial I/F receive trigger/status
Serial I/F receive enable
Serial I/F transmit trigger/status
Serial I/F transmit enable
Error
Reset (0)
Error
Reset (0)
Error
Reset (0)
Run
Trigger
Enable
Run
Trigger
Enable
No error
No operation
No error
No operation
No error
No operation
Stop
No operation
Disable
Stop
No operation
Disable
00FF4A D7
D6
D5
D4
D3
D2
D1
D0
TRXD7
TRXD6
TRXD5
TRXD4
TRXD3
TRXD2
TRXD1
TRXD0
X R/WHigh Low
Serial I/F transmit/Receive data D7 (MSB)
Serial I/F transmit/Receive data D6
Serial I/F transmit/Receive data D5
Serial I/F transmit/Receive data D4
Serial I/F transmit/Receive data D3
Serial I/F transmit/Receive data D2
Serial I/F transmit/Receive data D1
Serial I/F transmit/Receive data D0 (LSB)
00FF4B D7
D6
D5
D4
D3
D2
D1
D0
–
–
–
–
–
–
STPB
SDP
Constantly "0" when
being read
–
–
–
–
–
–
0
0
R/W
R/W
–
–
–
–
–
–
Serial I/F stop bit selection
Serial I/F data input/output permutation selection
–
–
–
–
–
–
2 bits
MSB first
–
–
–
–
–
–
1 bit
LSB first