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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST10F296 датащи(PDF) 141 Page - STMicroelectronics |
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ST10F296 датащи(HTML) 141 Page - STMicroelectronics |
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141 / 346 page  Obsolete Product(s) - Obsolete Product(s) ST10F296E Parallel ports 141/346 Figure 39. Block diagram of a Port 3 pin Pin P3.12 (BHE/WRH) is another pin with an alternate output function. However, its structure is slightly different to the Port 3 pin (see Figure 40). After reset, the BHE or WRH function must be used. In either case, port latches cannot be programmed before. Thus, the appropriate alternate function is selected automatically. If BHE/WRH is not used in the system, this pin can be used for general purpose I/O by disabling the alternate function (BYTDIS = 1/WRCFG = 0). Note: Enabling the BHE or WRH function automatically enables the P3.12 output driver. Setting bit DP3.12 = 1 is not required. During bus hold, pin P3.12 is switched back to its standard function and is then controlled by DP3.12 and P3.12. In this case, keep DP3.12 = 0 to ensure floating in hold mode. Open-drain latch Write ODP3.y Read ODP3.y Direction latch Write DP3.y Read DP3.y MUX 0 1 Alternate data input Input latch Clock P3.y Output buffer y = 13, 11 to 0 Port output latch Read P3.y Write P3.y & Alternate data input Port data output Obsolete Product(s) - Obsolete Product(s) |
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