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| 型號(hào)： | S1C88104P0A0100 |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, PBGA240 |
| 封裝： | VFBGA10H-216 |
| 文件頁(yè)數(shù)： | 20/211頁(yè) |
| 文件大?。?/td> | 1802K |
| 代理商： | S1C88104P0A0100 |
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108
EPSON
S1C8F626 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Programmable Timer)
FTCx is the interrupt factor flag corresponding to
interrupt of Timer x, and is set to "1" with the
compare match signal.
At this point, if the corresponding interrupt enable
register is set to "1" and the corresponding inter-
rupt priority register is set to a higher level than
the setting of the interrupt flags (I0 and I1), an
interrupt is generated to the CPU.
Regardless of the interrupt enable register and
interrupt priority register settings, the interrupt
factor flag is set to "1" when the interrupt genera-
tion condition is met.
To accept the subsequent interrupt after an
interrupt generation, it is necessary to re-set the
interrupt flags (set the interrupt flag to a lower
level than the level indicated by the interrupt
priority registers, or execute the RETE instruction)
and to reset the interrupt factor flag. The interrupt
factor flag is reset to "0" by writing "1".
In the 16-bit mode, the interrupt factor flag FTC(L)
is not set to "1" and Timer(L) interrupt is not
generated. In this mode, the interrupt factor flag
FTC(H) is set to "1" by the compare match of the
16-bit counter.
At initial reset, this flag is reset to "0".
5.10.10 Programming notes
(1) The programmable timer actually enters into
RUN or STOP status at the falling edge of the
input clock after writing to the PTRUNx
register. Consequently, when "0" is written to
PTRUNx, the timer stops after counting once
more (+1). PTRUNx is read as "1" until the
timer actually stops.
Figure 5.10.10.1 shows the timing chart at the
RUN/STOP control.
PTRUNx(WR)
PTMx
42H
41H 40H 3FH 3EH
3DH
PTRUNx(RD)
Input clock
Fig. 5.10.10.1 Timing chart at RUN/STOP control
(2) When the SLP instruction is executed while the
programmable timer is running (PTRUNx =
"1"), the timer stops counting during SLEEP
status. When SLEEP status is canceled, the
timer starts counting. However, the operation
becomes unstable immediately after SLEEP
status is canceled. Therefore, when shifting to
SLEEP status, stop the 16-bit programmable
timer (PTRUNx = "0") prior to executing the
SLP instruction.
Same as above, the TOUT signal output should
be disabled (PTOUTx = "0") so that an unstable
clock is not output to the clock output port
terminal.
(3) In the 16-bit mode, reading PTM(L) does not
latch the Timer(H) counter data in PTM(H). To
avoid generating a borrow from Timer(L) to
Timer(H), read the counter data after stopping
the timer by writing "0" to PTRUN(L).
(4) For the reason below, pay attention to the
reload data write timing when changing the
interval of the programmable timer interrupts
while the programmable timer is running.
The programmable timer counts down at the
falling edge of the input clock and at the same
time it generates an interrupt if the counter
underflows. Then it starts loading the reload
data to the counter and the counter data is
determined at the next rising edge of the input
clock (period shown in as in the figure).
Input clock
Counter data
(continuous mode)
(Reload data = 25H)
03H
02H
01H
00H
25H
24H
Underflow (interrupt is generated)
Counter data is determined by reloading
Fig. 5.10.10.2 Reload timing for programmable timer
To avoid improper reloading, do not rewrite
the reload data after an interrupt occurs until
the counter data is determined including the
reloading period . Be especially careful when
using the OSC1 (low-speed clock) as the clock
source of the programmable timer and the CPU
is operating with the OSC3 (high-speed clock).
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