
aPPenDiX a liST OF i/O ReGiSTeRS
S1C17624/604/622/602/621 TeChniCal Manual
Seiko epson Corporation
aP-a-5
0x4100–0x4105
uaRT (with irDa) Ch.0
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
uaRT Ch.0
Status Register
(uaRT_ST0)
0x4100
(8 bits)
D7
–
reserved
–
–
–
0 when being read.
D6
FeR
Framing error flag
1 Error
0 Normal
0
R/W Reset by writing 1.
D5
PeR
Parity error flag
1 Error
0 Normal
0
R/W
D4
OeR
Overrun error flag
1 Error
0 Normal
0
R/W
D3
RD2B
Second byte receive flag
1 Ready
0 Empty
0
R
D2
TRBS
Transmit busy flag
1 Busy
0 Idle
0
R Shift register status
D1
RDRY
Receive data ready flag
1 Ready
0 Empty
0
R
D0
TDBe
Transmit data buffer empty flag
1 Empty
0 Not empty
1
R
uaRT Ch.0
Transmit Data
Register
(uaRT_TXD0)
0x4101
(8 bits)
D7–0 TXD[7:0]
Transmit data
TXD7(6) = MSB
TXD0 = LSB
0x0 to 0xff (0x7f)
0x0 R/W
uaRT Ch.0
Receive Data
Register
(uaRT_RXD0)
0x4102
(8 bits)
D7–0 RXD[7:0]
Receive data in the receive data
buffer
RXD7(6) = MSB
RXD0 = LSB
0x0 to 0xff (0x7f)
0x0
R Older data in the buf-
fer is read out first.
uaRT Ch.0
Mode Register
(uaRT_MOD0)
0x4103
(8 bits)
D7–5 –
reserved
–
–
–
0 when being read.
D4
Chln
Character length select
1 8 bits
0 7 bits
0
R/W
D3
PRen
Parity enable
1 With parity
0 No parity
0
R/W
D2
PMD
Parity mode select
1 Odd
0 Even
0
R/W
D1
STPB
Stop bit select
1 2 bits
0 1 bit
0
R/W
D0
SSCK
Input clock select
1 External
0 Internal
0
R/W
uaRT Ch.0
Control Register
(uaRT_CTl0)
0x4104
(8 bits)
D7
–
reserved
–
–
–
0 when being read.
D6
Reien
Receive error int. enable
1 Enable
0 Disable
0
R/W
D5
Rien
Receive buffer full int. enable
1 Enable
0 Disable
0
R/W
D4
Tien
Transmit buffer empty int. enable
1 Enable
0 Disable
0
R/W
D3–2 –
reserved
–
–
–
0 when being read.
D1
RBFi
Receive buffer full int. condition setup 1 2 bytes
0 1 byte
0
R/W
D0
RXen
UART enable
1 Enable
0 Disable
0
R/W
uaRT Ch.0
expansion
Register
(uaRT_eXP0)
0x4105
(8 bits)
D7
–
reserved
–
–
–
0 when being read.
D6–4 iRClK[2:0] IrDA receive detection clock
division ratio select
IRCLK[2:0]
Division ratio
0x0 R/W Source clock = PCLK
0x7
0x6
0x5
0x4
0x3
0x2
0x1
0x0
1/128
1/64
1/32
1/16
1/8
1/4
1/2
1/1
D3–1 –
reserved
–
–
–
0 when being read.
D0
iRMD
IrDA mode select
1 On
0 Off
0
R/W
0x4120–0x4125
uaRT (with irDa) Ch.1
Register name address
Bit
name
Function
Setting
init. R/W
Remarks
uaRT Ch.1
Status Register
(uaRT_ST1)
0x4120
(8 bits)
D7
–
reserved
–
–
–
0 when being read.
D6
FeR
Framing error flag
1 Error
0 Normal
0
R/W Reset by writing 1.
D5
PeR
Parity error flag
1 Error
0 Normal
0
R/W
D4
OeR
Overrun error flag
1 Error
0 Normal
0
R/W
D3
RD2B
Second byte receive flag
1 Ready
0 Empty
0
R
D2
TRBS
Transmit busy flag
1 Busy
0 Idle
0
R Shift register status
D1
RDRY
Receive data ready flag
1 Ready
0 Empty
0
R
D0
TDBe
Transmit data buffer empty flag
1 Empty
0 Not empty
1
R
uaRT Ch.1
Transmit Data
Register
(uaRT_TXD1)
0x4121
(8 bits)
D7–0 TXD[7:0]
Transmit data
TXD7(6) = MSB
TXD0 = LSB
0x0 to 0xff (0x7f)
0x0 R/W
uaRT Ch.1
Receive Data
Register
(uaRT_RXD1)
0x4122
(8 bits)
D7–0 RXD[7:0]
Receive data in the receive data
buffer
RXD7(6) = MSB
RXD0 = LSB
0x0 to 0xff (0x7f)
0x0
R Older data in the buf-
fer is read out first.
uaRT Ch.1
Mode Register
(uaRT_MOD1)
0x4123
(8 bits)
D7–5 –
reserved
–
–
–
0 when being read.
D4
Chln
Character length select
1 8 bits
0 7 bits
0
R/W
D3
PRen
Parity enable
1 With parity
0 No parity
0
R/W
D2
PMD
Parity mode select
1 Odd
0 Even
0
R/W
D1
STPB
Stop bit select
1 2 bits
0 1 bit
0
R/W
D0
SSCK
Input clock select
1 External
0 Internal
0
R/W