INTEGRATED CIRCUIT TIMER WITH MULTIPLE CHANNEL AND DEDICATED SERVICE PROCESSOR

摘要

PURPOSE: To reduce the load of a CPU by providing equal functions for all the timer channels of a multi-timer channel so as to improve the performance of a timer subsystem. CONSTITUTION: A timer 15 uses clocks from two clock sources of a timer counting registers #1(TCRE1) and #2(TCRE2) as reference. TCRE1 is clocked by an internal clock source related with the system clock of a microcomputer 10. On the other hand, TCRE2 is clocked by an external source supplied from a pin. The timer 15 is provided with sixteen timer channels with an equal function CH. 0 to 15 and connected with a CPU 11 through an internal module bus(IMB) 12. The CPU 11 reads and writes from/in a timer register positioned at a memory location to interact with the timer 15. Thereby the load of the CPU is reduced.