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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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68HC05PL4 датащи(PDF) 63 Page - Freescale Semiconductor, Inc |
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68HC05PL4 датащи(HTML) 63 Page - Freescale Semiconductor, Inc |
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63 / 98 page  April 30, 1998 GENERAL RELEASE SPECIFICATION MC68HC05PL4 8-BIT TIMER REV 2.0 10-1 SECTION 10 8-BIT TIMER This section describes the 8-bit count down timer module. 10.1 OVERVIEW Figure 10-1. Timer8 Block Diagram As shown in Figure 10-1 this timer contains a single 8-bit software programmable countdown timer counter with a 3-bit software control prescaler. The counter’s value may be preset under software control and counts down to zero. When the counter decrements to zero, the timer8 interrupt request bit (T8IF in T8CR) is set. Then if the timer interrupt is enabled (T8IE in T8CR is set) and the I-bit of the con- dition code register are is cleared, the processor receives an interrupt. After com- pletion of the current instruction, the processor proceeds to store the appropriate registers on the stack and then fetches the timer8 interrupt vector in order to begin serving the interrupt. Interrupt Circuit Timer8 Counter Register ($0E) T8IF T8IFR T8IE T8EN PS2 PS1 PS0 Timer8 Control and Status Register ($0D) Overflow Detect Circuit 8-bit count-down timer counter 7-bit prescaler counter Prescaler Select Logic (8 to 1 MUX) 8 8 8 8 Internal Bus Clock To COP Watchdog Circuit Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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