參數(shù)資料
型號： S1C88848D0A0100
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8.2 MHz, MICROCONTROLLER, UUC192
封裝： DIE-192
文件頁數(shù)： 156/174頁
文件大?。?/td> 1304K
代理商： S1C88848D0A0100
74
EPSON
S1C88848 TECHNICAL MANUAL
5 PERIPHERAL CIRCUITS AND THEIR OPERATION (Programmable Timer)
This underflow signal controls an interrupt genera-
tion, pulse (TOUT signal) output and serial inter-
face clocking, in addition to reloading the counter.
■ Continuous/one-shot mode setting
By writing "1" to the continuous/one-shot mode
selection register CONTx, the programmable timer
is set to the continuous mode. In the continuous
mode, the initial counter value is automatically
loaded when an underflow is generated, and
counting is continued. This mode is suitable when
programmable intervals are necessary (such as an
interrupt and a synchronous clock for the serial
interface).
On the other hand, when writing "0" to the register
CONTx, the programmable timer is set to the one-
shot mode. The counter loads an initial value and
stops when an underflow is generated. At this time,
the RUN/STOP control register PRUNx is auto-
matically reset to "0". After the counter stops, a one-
shot count can be performed once again by writing
"1" to register PRUNx. This mode is suitable for
single time measurement, for example.
Input clock
Underflow
Continuous
mode
One-shot
mode
03H 02H 01H 00H A6H A5H A4H
03H 02H 01H 00H
A6H
Count
data
When "A6H" is set into reload data register RLDx.
Fig. 5.10.2.2 Continuous mode and one-shot mode
5.10.2 Count operation and
setting basic mode
Here we will explain the basic operation and
setting of the programmable timer.
■ Setting of initial value and counting down
The timers 0 to 3 have a down counter and reload
data register.
The reload data register RLDx0–RLDx7 (register for
timer x, x = 0 to 3) is used to set the initial value of
the counter.
By writing "1" to the preset control bit PSETx, the
down counter loads the initial value set in the
reload data register RLDx.
Therefore, down-counting is executed from the
stored initial value according to the input clock.
The register PRUNx is provided to control the
RUN/STOP for each timer.
After the reload data has been preset into the
counter, down-counting is begun by writing "1" to
this register. When "0" is written, the clock input is
disabled and the count stops.
The control of this RUN/STOP has no affect on the
counter data. The counter data is maintained even
during the stoppage of the counter and it can start
the count, continuing from that data.
The reading of the counter data can be done
through the data buffers PTDx0–PTDx7 with
optional timing.
When the down-counting has progressed and an
underflow is generated, the counter reloads the
initial value set in the reload data register RLDx.
PRUNx
PSETx
RLDx0–x7
Input clock
PTDx7
PTDx6
PTDx5
PTDx4
PTDx3
PTDx2
PTDx1
PTDx0
A6H
F3H
Preset
Reload and
interrupt generation
Fig. 5.10.2.1 Basic operation timing of the counter
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