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M306H3FCFP Datasheet(PDF) 13 Page - Renesas Technology Corp |
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M306H3FCFP Datasheet(HTML) 13 Page - Renesas Technology Corp |
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13 / 325 page  Rev.1.00 2004.03.23 page 13 of 320 M306H3MC-XXXFP/FCFP 2.3 Reset There are three types of resets: a hardware reset, a software reset, and an watchdog timer reset. 2.3.1 Hardware Reset ____________ ____________ A reset is applied using the RESET pin. When an “L” signal is applied to the RESET pin while the power supply voltage is within the recommended operating condition, the pins are initialized (see Table 2.3.1). ____________ The oscillation circuit is initialized and the main clock starts oscillating. When the input level at the RESET pin is released from “L” to “H”, the CPU and SFR are initialized, and the program is executed starting from ____________ the address indicated by the reset vector. The internal RAM is not initialized. If the RESET pin is pulled “L” while writing to the internal RAM, the internal RAM becomes indeterminate. Figure 2.3.1 shows the example reset circuit. Figure 2.3.2 shows the reset sequence. Table 2.3.1 shows ____________ the statuses of the other pins while the RESET pin is “L”. Figure 2.3.3 shows the CPU register status after reset. Refer to “SFR” for SFR status after reset. 1. When the power supply is stable ____________ (1) Apply an “L” signal to the RESET pin. (2) Supply a clock for 20 cycles or more to the XIN pin. ____________ (3) Apply an “H” signal to the RESET pin. 2. Power on ____________ (1) Apply an “L” signal to the RESET pin. (2) Let the power supply voltage increase until it meets the recommended operating condition. (3) Wait td(P-R) or more until the internal power supply stabilizes. (4) Supply a clock for 20 cycles or more to the XIN pin. ____________ (5) Apply an “H” signal to the RESET pin. |
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