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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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HT37B90 Arkusz danych(PDF) 23 Page - Holtek Semiconductor Inc |
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HT37B90 Arkusz danych(HTML) 23 Page - Holtek Semiconductor Inc |
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23 / 80 page  HT37B90/HT37B70/HT37B50/HT37B30 Rev.1.00 23 June22,2017 Timer/EventCounters The provision of timers form an important part of any microcontroller, giving the designer a means of carrying out time related functions. The devices contain two count-up timers 8-bit capacity and one count-up timers 16-bit capacity. As the timer 0/1 has three different oper- ating modes, they can be configured to operate as a general timer, an external event counter or as a pulse width measurement device. But the timer 2 only be con- figured to operate as a general timer. The provision of an internal prescaler to the clock circuitry of some of the timer/event counters gives added range to the timer 1/2. There are three types of registers related to the Timer/Event Counters 0. The first two register contain the actual high and low byte value of the timer and into whichaninitialvaluecanbe preloaded. There are two types of registers related to the Timer/Event Counters 1/2. The first is the register that contains the actual value of the timer and into which an initial value can be preloaded. Reading from this register retrieves the contents of the Timer/Event Counter. The second type of associated register is the Timer Control Register which defines the timer options and deter- mines how the timer is to be used. The Timer/Event Counter 0 can have the timer clock configured to come from the internal clock source. The clock source is fOSC/8.In addition, the timer clock source of Timer/Event Counter 0 can also be configured to come from an inter- nalRC12kHz. An external clock source is used when the timer is in the event counting mode, the clock source being provided on the external timer pin, known as TMR0 or TMR1. These external timer pins are pin-shared with other I/O pins. Depending upon the condition of PA share pin op- tion, each high to low, or low to high transition on the ex- ternaltimerinputpinwillincrementthecounterbyone. T M R 0 T 0 E T i m e r / E v e n t C o u n t e r M o d e C o n t r o l T 0 O N T 0 M 1 T 0 M 0 D a t a B u s R e l o a d O v e r f l o w t o I n t e r r u p t L o w B y t e B u f f e r H i g h B y t e L o w B y t e 1 6 - B i t T i m e r / E v e n t C o u n t e r 1 6 - b i t T i m e r / E v e n t C o u n t e r P r e l o a d R e g i s t e r M U X f O S C / 8 R C 1 2 K T 0 S 16-bitTimer/EventCounter0Structure T M R 1 T 1 E T i m e r / E v e n t C o u n t e r M o d e C o n t r o l T 1 O N P r e l o a d R e g i s t e r T i m e r / E v e n t C o u n t e r D a t a B u s R e l o a d O v e r f l o w t o I n t e r r u p t T 1 P S C 2 ~ T 1 P S C 0 ( 1 / 1 6 ~ 1 / 2 0 4 8 ) T 1 M 1 T 1 M 0 8 - S t a g e P r e s c a l e r f O S C 8-bitTimer/EventCounter1Structure T i m e r C o u n t e r M o d e C o n t r o l T 2 O N P r e l o a d R e g i s t e r T i m e r C o u n t e r D a t a B u s R e l o a d O v e r f l o w t o I n t e r r u p t T 2 P S C 2 ~ T 2 P S C 0 ( 1 / 1 6 ~ 1 / 2 0 4 8 ) T 2 M 1 T 2 M 0 f O S C 8 - S t a g e P r e s c a l e r 8-bitTimerCounter2Structure |
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