Epson S1C88650 Technical Manual page 96

5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Programmable Timer)
[8-bit mode]
8-bit data
Timer 0
input clock
Timer 1
input clock
8-bit data
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)
Address Bit Name
00FF30 D7 MODE16_A
D6 PTNREN_A
D5 –
D4 –
D3 PTOUT0
D2 PTRUN0
D1 PSET0
D0 CKSEL0
00FF31 D7 –
D6 –
D5 –
D4 –
D3 PTOUT1
D2 PTRUN1
D1 PSET1
D0 CKSEL1
Table 5.10.2.1(b) Control registers in 16-bit mode (example of Timers 0 and 1)
Address Bit Name
00FF30 D7 MODE16_A
D6 PTNREN_A
D5 –
D4 –
D3 PTOUT0
D2 PTRUN0
D1 PSET0
D0 CKSEL0
00FF31 D7 –
D6 –
D5 –
D4 –
D3 PTOUT1
D2 PTRUN1
D1 PSET1
D0 CKSEL1
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.
88
Interrupt request
Timer 0
TOUT output
Interrupt request
Timer 1
TOUT output
Function
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
–
–
–
R/W register
PTM1 clock output control
PTM1 Run/Stop control
PTM1 preset
PTM1 input clock selection
Function
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
–
–
–
R/W register
PTM1 clock output control
Invalid (fixed at "0")
Invalid (fixed at "0")
Invalid (fixed at "0")
[16-bit mode]
Low-order 8-bit data
Timer 0
Timer 0
input clock
Timer 0
underflow
Timer 1
signal
High-order 8-bit data
1 0
- -
16 bit x 1 8 bit x 2
Enable Disable
– –
1 0
On Off
Run Stop
Preset No operation
External clock Internal clock
– –
– –
– –
1 0
On Off
Run Stop
Preset No operation
External clock Internal clock
1 0
- -
16 bit x 1 8 bit x 2
Enable Disable
– –
1 0
Invalid Fixed at "0"
Run Stop
Preset No operation
External clock Internal clock
– –
– –
– –
1 0
On Off
Invalid Fixed at "0"
Invalid Fixed at "0"
Invalid Fixed at "0"
EPSON
Interrupt request
TOUT output
SR R/W Comment
0 R/W
0 R/W
–
"0" when being read
0 R/W
Reserved register
0 R/W
0 R/W
0 W
"0" when being read
0 R/W
–
Constantly "0" when
–
being read
–
0 R/W
Reserved register
0 R/W
0 R/W
0 W
"0" when being read
0 R/W
SR R/W Comment
0 R/W
0 R/W
–
"0" when being read
0 R/W
Reserved register
0 R/W
0 R/W
0 W
"0" when being read
0 R/W
–
Constantly "0" when
–
being read
–
0 R/W
Reserved register
0 R/W
0 R/W
0 W
"0" when being read
0 R/W
S1C88650 TECHNICAL MANUAL