
II-22
EPSON
S1C88348/317/316/308 TECHNICAL SOFTWARE
6 OUTPUT PORTS (R PORTS)
I/O Map
Address Bit
Name
SR R/W
Function
Comment
10
00FF76 D7
D6
D5
D4
D3
D2
D1
D0
R37D
R36D
R35D
R34D
R33D
R32D
R31D
R30D
R37 output port data
R36 output port data
R35 output port data
R34 output port data
R33 output port data
R32 output port data
R31 output port data
R30 output port data
These are just
R/W registers
on S1C88308
1R/W
High
Low
00FF77 D7
D6
D5
D4
D3
D2
D1
D0
R47D
R46D
R45D
R44D
R43D
R42D
R41D
R40D
R/W register
Reserved register
1R/W
1
0
00FF78 D7
D6
D5
D4
D3
D2
D1
D0
–
R51D
R50D
–
R51 output port data
R50 output port data
Constantly "0" when
being read
–
1
0
R/W
–
High
–
Low
*1
00FF10 D7
D6
D5
D4
D3
D2
D1
D0
–
LCCLK
LCFRM
DTFNT
LDUTY
SGOUT
–
CL output control for expanded LCD driver
FR output control for expanded LCD driver
LCD dot font selection
LCD drive duty selection
R/W register
Constantry "0" when
being read
–
0
R/W
–
On
5 x 5 dots
1/16 duty
1
–
Off
5 x 8 dots
1/32 duty
0
*2
Reserved register
00FF44 D7
D6
D5
D4
D3
D2
D1
D0
–
BZSTP
BZSHT
SHTPW
ENRTM
ENRST
ENON
BZON
–
One-shot buzzer forcibly stop
One-shot buzzer trigger/status
One-shot buzzer duration width selection
Envelope attenuation time
Envelope reset
Envelope On/Off control
Buzzer output control
Constantry "0" when
being read
"0" when being read
*3
–
0
–
0
W
R/W
W
R/W
–
Forcibly stop
Busy
Trigger
125 msec
1 sec
Reset
On
–
No operation
Ready
No operation
31.25 msec
0.5 sec
No operation
Off
R
W
00FF30 D7
D6
D5
D4
D3
D2
D1
D0
–
MODE16
CHSEL
PTOUT
CKSEL1
CKSEL0
–
8/16-bit mode selection
TOUT output channel selection
TOUT output control
Prescaler 1 source clock selection
Prescaler 0 source clock selection
Constantry "0" when
being read
–
0
R/W
–
16-bit x 1
Timer 1
On
fOSC3
–
8-bit x 2
Timer 0
Off
fOSC1
*1 This is just R/W register on S1C88308.
*2 When 1/8 duty has been selected by mask option, setting of this register becomes invalid.
*3 Reset to "0" during one-shot output.