Epson S1C63558 4.10.2 Setting of initial value and counting down

CHAPTER 4: PERIPHERAL CIRCUITS AND OPERATION (Programmable Timer)

4.10.2 Setting of initial value and counting down

Timers 0 and 1 each have a down counter and reload data register.

The reload data registers RLD00–RLD07 (timer 0) and RLD10–RLD17 (timer 1) are used to set the initial value to the down counter.

By writing "1" to the timer reset bit PTRST0 (timer 0) or PTRST1 (timer 1), the down counter loads the initial value set in the reload register RLD. Therefore, down-counting is executed from the stored initial value by the input clock.

The registers PTRUN0 (timer 0) and PTRUN1 (timer 1) are provided to control the RUN/STOP for timers 0 and 1. By writing "1" to the register after presetting the reload data to the down counter, the down counter starts counting down. Writing "0" stops the input count clock and the down counter stops counting. This control (RUN/STOP) does not affect the counter data. The counter maintains its data while stopped, and can restart counting continuing from that data.

The counter data can be read via the data buffers PTD00–PTD07 (timer 0) and PTD10–PTD17 (timer 1) in optional timing. However, the counter has the data hold function the same as the clock timer, that holds the high-order data when the low-order data is read in order to prevent the borrowing operation between low- and high-order reading, therefore be sure to read the low-order data first.

The counter reloads the initial value set in the reload data register RLD when an underflow occurs through the count down. It continues counting down from the initial value after reloading.

In addition to reloading the counter, this underflow signal controls the interrupt generation, pulse (TOUT signal) output and clock supplying to the serial interface.

PTRUN0 (1)
PTRST0 (1)
RLD00–07 (10–17)		A6H	F3H
Input clock
PTD07 (17)
PTD06 (16)
PTD05 (15)
PTD04 (14)
PTD03 (13)
PTD02 (12)
PTD01 (11)
PTD00 (10)
	Preset		Reload &
			Interrupt generation

Fig. 4.10.2.1 Basic operation timing of down counter

66 EPSON S1C63558 TECHNICAL MANUAL