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HT56RB688 データシート(PDF) 50 Page - Holtek Semiconductor Inc |
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HT56RB688 データシート(HTML) 50 Page - Holtek Semiconductor Inc |
50 / 164 page Timer/Event Counters The provision of timers form an important part of any microcontroller, giving the designer a means of carrying out time related functions. The device contains several 8-bit and 16-bit count-up timers. As each timer has three different operating modes, they can be configured to operate as a general timer, an external event counter or as a pulse width measurement device. The provision of a prescaler to the clock circuitry of the 8-bit Timer/Event Counter also gives added range to this timer. There are two types of registers related to the Timer/Event Counters. The first are the registers that contain the actual value of the Timer/Event Counter and into which an initial value can be preloaded. Reading from these registers 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 determines how the Timer/Event Counter is to be used. The Timer/Event Counters can have their clock configured to come from an internal clock source. In addition, their clock source can also be configured to come from an external timer pin. Rev. 1.10 50 April 15, 2013 HT56RB688 TinyPowerTM A/D type Smart Card OTP MCU with LCD, DAC, ISO 7816 and USB Interfaces T M R n 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 n 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 2 7 - s t a g e P r e s c a l e r T n P S C 2 ~ T n P S C 0 ( 1 / 1 ~ 1 / 1 2 8 ) 8 - b i t T i m e r / E v e n t C o u n t e r T n M 1 T n M 0 f S Y S P F D 0 ¸ T n E F i l t e r T M n F L T ( F i l t e r O n / O f f c o n t r o l ) 8-bit Timer/Event Counter Structure T M R n T n 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 1 6 - B i t P r e l o a d R e g i s 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 L o w B y t e B u f f e r T n M 1 T n M 0 T n O N 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 P F D 1 2 ¸ T n S M U X f S Y S / 4 M U X f S U B E x t e r n a l 3 2 7 6 8 H z I n t e r n a l 3 2 K - I N T C o n f i g u r a t i o n O p t i o n F i l t e r T M n F L T ( F i l t e r O n / O f f c o n t r o l ) 16-bit Timer/Event Counter Structure M U X P F D 0 P F D 1 C o n f i g u r a t i o n O p t i o n P F D |
同様の部品番号 - HT56RB688_13 |
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同様の説明 - HT56RB688_13 |
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