III PERIPHERAL BLOCK: CLOCK TIMER
Programming Notes
(1)The
(2)At initial reset, the clock timer counter data, the setup contents of alarms, and control bits, including RUN/STOP, are not initialized. Therefore, always initialize the clock timer in the software following power- on.
(3)The clock timer reset bit TCRST and the clock timer RUN/STOP control bit TCRUN are located at the same address (0x40151). However, the clock timer cannot be reset at the same time it is set to RUN by writing "1" to both. In this case, the reset input is ignored and the timer starts counting up from the counter values then in effect. When resetting the timer, always make sure TCRUN = "0" (timer stopped).
(4)When the counters are cleared as the clock timer is reset, an interrupt may be generated depending on the register settings. Therefore, before resetting the clock timer, first disable the clock timer interrupt and, after resetting the clock timer, reset the interrupt factor flag and the interrupt factor generation and alarm factor generation flags.
(5)To prevent generation of an unwanted interrupt, disable the clock timer interrupt before selecting the interrupt and alarm factors. Then, before reenabling the interrupt, reset each factor generation flag and the interrupt factor flag.
(6)The interrupt factor flag (FCTM) becomes indeterminate at initial reset. To prevent generation of an unwanted interrupt, be sure to reset the flag in a program.
(7)To prevent regeneration of interrupts with the same factor after an interrupt has occurred, be sure to reset the interrupt factor flag (FCTM) before setting the PSR again or executing the reti instruction.
EPSON | S1C33L03 FUNCTION PART |