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TMP93CS44 датащи(PDF) 24 Page - Toshiba Semiconductor |
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TMP93CS44 датащи(HTML) 24 Page - Toshiba Semiconductor |
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24 / 224 page ![]() TMP93CS44/S45 2004-02-10 93CS44-22 3.3.2 Prescaler Clock Controller The 9-bit prescaler provides a clock to 8-bit timer 0, 1, 2, 3, 16-bit timer 4, 5, and serial interface 0, 1. The clock input to the 9-bit prescaler is selected either fFPH, fc/16, or fs by SYSCR0<PRCK1:0> register. <PRCK1:0> register is initialized to “00” by resetting. When the IDLE 1 mode (Operates only oscillator) is used, set TRUN<PRRUN> to “0” to stop 9 bit prescaler before “HALT” instruction is executed. 3.3.3 Internal Clock Pin Output Function CLK pin outputs fSYS divided by 2 internal clock. Outputs are specified by the clock output control register CKOCR<CLKEN>. Writing “1” sets clock output, and writing “0” sets high impedance. After reset, CKOCR<CLKEN> is depended on each product types. It is necessary to set for each usage. Table 3.3.3 shows the value and operation after reset. During reset, CLK pin is internally pulled up regardless of the value of <CLKEN> register. See “TMP93CS44/S45 Reset Timing Chart” in Figure 3.1.1 and Figure 3.1.2. Table 3.3.3 <CLKEN> and CLK Pin Operation after Reset Type Number CKOCR<CLKEN> CLK Pin Operation TMP93CS44 0 High impedance TMP93CS45 1 fSYS/2 clock output Note: To set <CLKEN> = “0” and set CLK pin to high impedance, pull up externally to prevent through current which follows to the input buffer of CLK pin. |
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