Epson S1C17704, Technical Manual

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13 PWM & CAPTURE TIMER (T16E)
13-16
EPSON
S1C17704 TECHNICAL MANUAL
D3 CLKSEL: Input Clock Select Bit
Selects the input clock for the timer.
1 (R/W): External clock
0 (R/W): Internal clock (default)
The internal clock (prescaler output) is selected for the input clock of the timer by writing 0 to CLKSEL.
An external clock (one that is fed from the EXCL3 (P27) pin) is selected by writing 1, and the timer
functions as an event counter.
Note : To input the EXCL3 clock from the P27 port, write 1 to P27MUX (D7/P2_PMUX register) to
switch the P27 pin function in advance.
∗
P27MUX : P27 Port Function Select Bit in the P2 Port Function Select (P2_PMUX) Register
D2 OUTEN: Clock Output Enable Bit
Controls the output of the TOUT signal (timer output clock).
1 (R/W): Enable
0 (R/W): Disable (default)
The TOUT signal is output from the TOUT (P26) output pin by writing 1 to OUTEN. Clock output is
stopped by writing 0 to OUTEN and goes to the off level according to the set values of INVOUT (D4)
and INITOL (D8). In this case, the P26 pin must be set for the TOUT output using the P26 port func-
tion select register before outputting the TOUT signal.
D1 T16ERST: Timer Reset Bit
Resets the counter.
1 (W): Reset
0 (W): Has no effect
0 (R): Always 0 when read (default)
Writing 1 to T16ERST resets the counter in the PWM & capture timer.
D0 T16ERUN: Timer Run/Stop Control Bit
Controls the timer's Run/Stop state.
1 (R/W): Run
0 (R/W): Stop (default)
The PWM & capture timer starts counting up by writing 1 to T16ERUN and stops by writing 0. In Stop
state, the counter data is retained until the timer is reset or placed in a Run state. By changing states
from Stop to Run, the timer can restart counting beginning at the retained count.