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88 EPSON S1C88650 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Programmable Timer)
8-bit data High-order 8-bit data
[8-bit mode]
8-bit data
Timer 0
input clock
Timer 1
input clock
Interrupt request
TOUT output
Interrupt request
TOUT output
[16-bit mode]
Low-order 8-bit data
Timer 0
input clock
Timer 0
underflow
signal
Interrupt request
TOUT output
Timer 0
Timer 1
Timer 0
Timer 1
Fig. 5.10.2.1 Counter configuration in 8- and 16-bit mode (example of Timers 0 and 1)
Table 5.10.2.1(a) Control registers in 8-bit mode (example of Timers 0 and 1)
SR R/WAddress Bit Name Function Comment10
D7
D6
D5
D4
D3
D2
D1
D0
00FF30
MODE16_A
PTNREN_A
–
–
PTOUT0
PTRUN0
PSET0
CKSEL0
"0" when being read
Reserved register
"0" when being read
0
0
–
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
W
R/W
PTM0–1 8/16-bit mode selection
External clock 0 noise rejecter selection
–
R/W register
PTM0 clock output control
PTM0 Run/Stop control
PTM0 preset
PTM0 input clock selection
16-bit x 1
Enable
–
1
On
Run
Preset
External clock
8
-bit x 2
Disable
–
0
Off
Stop
No operation
Internal clock
00FF31 D7
D6
D5
D4
D3
D2
D1
D0
–
–
–
–
PTOUT1
PTRUN1
PSET1
CKSEL1
–
–
–
R/W register
PTM1 clock output control
PTM1 Run/Stop control
PTM1 preset
PTM1 input clock selection
Constantly "0" when
being read
Reserved register
"0" when being read
–
–
–
0
0
0
0
0
R/W
R/W
R/W
W
R/W
–
–
–
0
Off
Stop
No operation
Internal clock
–
–
–
1
On
Run
Preset
External clock
Table 5.10.2.1(b) Control registers in 16-bit mode (example of Timers 0 and 1)
SR R/WAddress Bit Name Function Comment10
D7
D6
D5
D4
D3
D2
D1
D0
00FF30
MODE16_A
PTNREN_A
–
–
PTOUT0
PTRUN0
PSET0
CKSEL0
"0" when being read
Reserved register
"0" when being read
0
0
–
0
0
0
0
0
R/W
R/W
R/W
R/W
R/W
W
R/W
PTM0–1 8/16-bit mode selection
External clock 0 noise rejecter selection
–
R/W register
Invalid (fixed at "0")
PTM0 Run/Stop control
PTM0 preset
PTM0 input clock selection
16-bit x 1
Enable
–
1
Invalid
Run
Preset
External clock
8
-bit x 2
Disable
–
0
Fixed at "0"
Stop
No operation
Internal clock
00FF31 D7
D6
D5
D4
D3
D2
D1
D0
–
–
–
–
PTOUT1
PTRUN1
PSET1
CKSEL1
–
–
–
R/W register
PTM1 clock output control
Invalid (fixed at "0")
Invalid (fixed at "0")
Invalid (fixed at "0")
Constantly "0" when
being read
Reserved register
"0" when being read
–
–
–
0
0
0
0
0
R/W
R/W
R/W
W
R/W
–
–
–
0
Off
Fixed at "0"
Fixed at "0"
Fixed at "0"
–
–
–
1
On
Invalid
Invalid
Invalid
Note: The register names contain a timer number (0–7) to identify the timer to which the register belongs.
The following explanation uses "x" instead of the timer number except when it is required. For
example, PTRUNx represents PTRUN0 through PTRUN7. Furthermore, a pair of timers are
described as Timer(L) and Timer(H) in explanations for 16-bit mode.
Timer(L) = Timer 0, Timer 2, Timer 4 or Timer 6
Timer(H) = Timer 1, Timer 3, Timer 5 or Timer 7
This is used for register names.