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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HD404812FS датащи(PDF) 49 Page - Renesas Technology Corp |
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HD404812FS датащи(HTML) 49 Page - Renesas Technology Corp |
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49 / 100 page  HD404818 Series 47 Timers The MCU provides prescalers S and W (each with a different input clock source), and three timer/ counters (timers A, B, and C). Figures 25, 26 and 27 show their diagrams. Prescaler S: The input to prescaler S is the system clock signal. The prescaler is initialized to $000 by MCU reset, and starts to count up with the system clock signal as soon as the RESET input goes low. The prescaler keeps counting up except at MCU reset and in the stop and watch modes. The prescaler provides input clock signals to timers A to C and the transmit clock of the serial interface. They can be selected by timer mode registers A (TMA), B (TMB), C (TMC), and the serial mode register (SMR), respectively. Prescaler W: The input to prescaler W is a clock which divides the X1 input clock by 8. The output of prescaler W is available as an input clock for timer A by controlling timer mode register A (TMA). Timer A Operation: After timer A is initialized to $00 by MCU reset, it counts up at every clock input signal. When the next clock signal is applied after timer A has counted up to $FF, timer A is set to $00 again, and an overflow output is generated. This sets the timer A interrupt request flag (IFTA: $001, bit 2) to 1. Therefore, timer A can function as an interval timer periodically generating overflow output at every 256th clock signal input (figure 25). To use timer A as a watch time base, set TMA3 to 1. Timer counter A receives prescaler W output, and timer A generates interrupts with accurate timing (reference clock = 32-kHz crystal oscil lator). When using timer A as a watch time base, prescaler W and the timer counter can be initialized to $0 by setting timer mode register A. The clock input signals to timer A are selected by timer mode register A (TMA: $008). |
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