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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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HT66F40 数据表(PDF) 90 Page - Holtek Semiconductor Inc |
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HT66F40 数据表(HTML) 90 Page - Holtek Semiconductor Inc |
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90 / 244 page  HT68F20/HT68F30/HT68F40/HT68F50/HT68F60 HT68FU30/HT68FU40/HT68FU50/HT68FU60 Rev. 1.60 90 October 24, 2011 · Reading Data from the Counter Registers and CCRB or CCRA ¨ Step 1. Read data from the High Byte TMxDH, TMxAH or TMxBH - here data is read directly from the High Byte registers and simultaneously data is latched from the Low Byte register into the 8-bit buffer. ¨ Step 2. Read data from the Low Byte TMxDL, TMxAL or TMxBL - this step reads data from the 8-bit buffer. Compact Type TM Although the simplest form of the three TM types, the Compact TM type still contains three operating modes, which are Compare Match Output, Timer/Event Counter and PWM Output modes. The Compact TM can also be controlled with an external input pin and can drive one or two external output pins. These two external output pins can be the same sig- nal or the inverse signal. CTM Name TM No. TM Input Pin TM Output Pin HT68F20 10-bit CTM 0 TCK0 TP0_0 HT68F30 10-bit CTM 0 TCK0 TP0_0, TP0_1 HT68F40 10-bit CTM 0 TCK0 TP0_0, TP0_1 HT68F50 10-bit CTM 0, 3 TCK0, TCK3 TP0_0, TP0_1; TP3_0, TP3_1 HT68F60 10-bit CTM 0, 3 TCK0, TCK3 TP0_0, TP0_1; TP3_0, TP3_1 Compact TM Operation At its core is a 10-bit count-up counter which is driven by a user selectable internal or external clock source. There are also two internal comparators with the names, Comparator A and Comparator P. These comparators will compare the value in the counter with CCRP and CCRA registers. The CCRP is three bits wide whose value is compared with the highest three bits in the counter while the CCRA is the ten bits and therefore compares with all counter bits. The only way of changing the value of the 10-bit counter using the application program, is to clear the counter by chang- ing the TnON bit from low to high. The counter will also be cleared automatically by a counter overflow or a compare match with one of its associated comparators. When these conditions occur, a TM interrupt signal will also usually be generated. The Compact Type TM can operate in a number of different operational modes, can be driven by different clock sources including an input pin and can also control an output pin. All operating setup conditions are selected us- ing relevant internal registers. C C R P C C R A T n C C L R C o m p a r a t o r P M a t c h C o m p a r a t o r A M a t c h T n C K 2 ~ T n C K 0 T n O N T n P A U b 7 ~ b 9 3 - b i t C o m p a r a t o r P T C K n 1 0 - b i t C o m p a r a t o r A C o u n t e r C l e a r 1 0 - b i t C o u n t - u p C o u n t e r T n P F I n t e r r u p t T n A F I n t e r r u p t T P n P i n O u t p u t b 0 ~ b 9 T n M 1 , T n M 0 T n I O 1 , T n I O 0 T n P O L T n O C P o l a r i t y C o n t r o l O u t p u t C o n t r o l T P n _ 0 T P n _ 1 1 1 1 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 f S Y S / 4 f S Y S f H / 1 6 f H / 6 4 f T B C R e s e r v e d 0 1 Compact Type TM Block Diagram |
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