Epson S1C63666 Technical Manual page 97

RLD00–RLD07: Timer 0 reload data register (FFC6H, FFC7H)
RLD10–RLD17: Timer 1 reload data register (FFC8H, FFC9H)
RLD20–RLD27: Timer 2 reload data register (FFCAH, FFCBH)
Sets the initial value for the counter.
The reload data written in this register is loaded to the respective counters. The counter counts down
using the data as the initial value for counting.
Reload data is loaded to the counter when the counter is reset by writing "1" to the PTRSTx register, or
when counter underflow occurs.
At initial reset, these registers are set to "00H".
PTD00–PTD07: Timer 0 counter data (FFCCH, FFCDH)
PTD10–PTD17: Timer 1 counter data (FFCEH, FFCFH)
PTD20–PTD27: Timer 2 counter data (FFD0H, FFD1H)
Count data in the programmable timer can be read from these latches.
The low-order 4 bits of the count data in timer x can be read from PTDx0–PTDx3, and the high-order data
can be read from PTDx4–PTDx7. Since the high-order 4 bits are held by reading the low-order 4 bits, be
sure to read the low-order 4 bits first.
Since these latches are exclusively for reading, the writing operation is invalid.
At initial reset, these counter data are set to "00H".
PTRST0: Timer 0 reset (reload) (FFC3H•D1)
PTRST1: Timer 1 reset (reload) (FFC4H•D1)
PTRST2: Timer 2 reset (reload) (FFC5H•D1)
Resets the timer and presets reload data to the counter.
When "1" is written: Reset
When "0" is written: No operation
Reading: Always "0"
By writing "1" to PTRSTx, the reload data in the reload register RLDx0–RLDx7 is preset to the counter in
timer x. When the counter is preset in the RUN status, the counter restarts immediately after presetting.
In the case of STOP status, the reload data is preset to the counter and is maintained.
No operation results when "0" is written.
Since these bits are exclusively for writing, always set to "0" during reading.
PTRUN0: Timer 0 RUN/STOP control register (FFC3H•D0)
PTRUN1: Timer 1 RUN/STOP control register (FFC4H•D0)
PTRUN2: Timer 2 RUN/STOP control register (FFC5H•D0)
Controls the RUN/STOP of the counter.
When "1" is written: RUN
When "0" is written: STOP
Reading: Valid
The counter in timer x starts counting down by writing "1" to the PTRUNx register and stops by writing
"0". In STOP status, the counter data is maintained until the counter is reset or is set in the next RUN
status. When STOP status changes to RUN status, the data that has been maintained can be used for
resuming the count.
At initial reset, these registers are set to "0".
S1C63666 TECHNICAL MANUAL
CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Programmable Timer)
EPSON
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