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20 EPSON S1C88650 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (I/O Memory Map)
Table 5.1.1(c) I/O Memory map (00FF15H–00FF18H)
SR R/WAddress Bit Name Function Comment10
00FF15 D7
D6
D5
D4
D3
D2
D1
D0
PRPRT3
PST32
PST31
PST30
PRPRT2
PST22
PST21
PST20
Programmable timer 3 clock control
Programmable timer 3 division ratio
Programmable timer 2 clock control
Programmable timer 2 division ratio
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
On
On
Off
Off
PST32
1
1
1
1
0
0
0
0
PST31
1
1
0
0
1
1
0
0
PST30
1
0
1
0
1
0
1
0
(OSC3)
f
OSC3
/ 4096
f
OSC3
/ 1024
f
OSC3
/ 256
f
OSC3
/ 64
f
OSC3
/ 32
f
OSC3
/ 8
f
OSC3
/ 2
f
OSC3
/ 1
(OSC1)
f
OSC1
/ 128
f
OSC1
/ 64
f
OSC1
/ 32
f
OSC1
/ 16
f
OSC1
/ 8
f
OSC1
/ 4
f
OSC1
/ 2
f
OSC1
/ 1
PST22
1
1
1
1
0
0
0
0
PST21
1
1
0
0
1
1
0
0
PST20
1
0
1
0
1
0
1
0
(OSC3)
f
OSC3
/ 4096
f
OSC3
/ 1024
f
OSC3
/ 256
f
OSC3
/ 64
f
OSC3
/ 32
f
OSC3
/ 8
f
OSC3
/ 2
f
OSC3
/ 1
(OSC1)
f
OSC1
/ 128
f
OSC1
/ 64
f
OSC1
/ 32
f
OSC1
/ 16
f
OSC1
/ 8
f
OSC1
/ 4
f
OSC1
/ 2
f
OSC1
/ 1
00FF17 D7
D6
D5
D4
D3
D2
D1
D0
–
–
–
–
PRTF3
PRTF2
PRTF1
PRTF0
–
–
–
R/W register
Programmable timer 3 source clock selection
Programmable timer 2 source clock selection
Programmable timer 1 source clock selection
Programmable timer 0 source clock selection
Constantly "0" when
being read
Reserved register
–
–
–
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
–
–
–
1
f
OSC1
f
OSC1
f
OSC1
f
OSC1
–
–
–
0
f
OSC3
f
OSC3
f
OSC3
f
OSC3
00FF18 D7
D6
D5
D4
D3
D2
D1
D0
PRPRT5
PST52
PST51
PST50
PRPRT4
PST42
PST41
PST40
Programmable timer 5 clock control
Programmable timer 5 division ratio
Programmable timer 4 clock control
Programmable timer 4 division ratio
0
0
0
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
On
On
Off
Off
PST52
1
1
1
1
0
0
0
0
PST51
1
1
0
0
1
1
0
0
PST50
1
0
1
0
1
0
1
0
(OSC3)
f
OSC3
/ 4096
f
OSC3
/ 1024
f
OSC3
/ 256
f
OSC3
/ 64
f
OSC3
/ 32
f
OSC3
/ 8
f
OSC3
/ 2
f
OSC3
/ 1
(OSC1)
f
OSC1
/ 128
f
OSC1
/ 64
f
OSC1
/ 32
f
OSC1
/ 16
f
OSC1
/ 8
f
OSC1
/ 4
f
OSC1
/ 2
f
OSC1
/ 1
PST42
1
1
1
1
0
0
0
0
PST41
1
1
0
0
1
1
0
0
PST40
1
0
1
0
1
0
1
0
(OSC3)
f
OSC3
/ 4096
f
OSC3
/ 1024
f
OSC3
/ 256
f
OSC3
/ 64
f
OSC3
/ 32
f
OSC3
/ 8
f
OSC3
/ 2
f
OSC3
/ 1
(OSC1)
f
OSC1
/ 128
f
OSC1
/ 64
f
OSC1
/ 32
f
OSC1
/ 16
f
OSC1
/ 8
f
OSC1
/ 4
f
OSC1
/ 2
f
OSC1
/ 1