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MSM6404 датащи(PDF) 21 Page - OKI electronic componets |
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MSM6404 датащи(HTML) 21 Page - OKI electronic componets |
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21 / 25 page ![]() 21/25 MSM6404A/6404VS ¡ Semiconductor Differences between MSM6404A and MSM6404VS (PIGGYBACK) Item MSM6404A MSM6404VS (Piggyback) 1. Ports P0, 1, 3 are set to "1" and ports P2, 4, 5, 6, 7, 8 are reset to "0" directly by the reset input signal. Ports P0, 1, 3 are set to "1" and ports P2, 4, 5, 6, 7, 8 are initialized during reset cycle. After being reset, the timer continues to stop until data is set in it. It is undefined whether the timer starts or not after being reset. Therefore, the timer should be initialized by software. Serial out F/F (SOF/F) is set to "0" after being reset. It is undefined whether serial out F/F (SOF/F) is "0" or "1" after being reset. Therefore the serial out F/F should be initialized by software. Port initialization during reset 2. Timer operation 3. Shift register Internal clock Internal clock Port input/output timing 4. Input Data are input at this time. Input Data are input at this time. Internal clock Synchronized with falling edge Data are output at this time. Data are output at this time. Output TTL FO = "1" (IOL = 1.6 mA @ 0.4 V) LSTTL FO = "1" (IOL = 0.4 mA @ 0.4 V) Port input/output characteristics 5. P2.0-3 P2.0-3 VDD VDD VDD TTL compatible input CMOS input P0.0-P8.3 P0.0-P8.3 (Except P2.0-3) (Except P2.0-3) Up to 4 Kbytes Up to 8 Kbytes accessible Available ROM capacity Not available Available LJP a13, LCAL a13 instruction Internal clock Output 6. 7. |
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