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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ST10F269Z2QX 数据表(PDF) 72 Page - STMicroelectronics |
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ST10F269Z2QX 数据表(HTML) 72 Page - STMicroelectronics |
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72 / 161 page  ST10F269Z2Qx 72/161 Pin P3.12 (BHE/WRH) is another pin with an alternate output function, however, its structure is slightly different. After reset the BHE or WRH function must be used depending on the system start-up configuration. In either of these cases, there is no possibility to program any port latches 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. Keep DP3.12 = ’0’ in this case to ensure floating in hold mode. Figure 29 : Block Diagram of Pins P3.15 (CLKOUT) and P3.12 (BHE/WRH) Direction Latch Write DP3.x Read DP3.x Port Output Latch Write P3.x Read P3.x MUX 0 1 MUX 0 1 Alternate Data Output MUX 0 1 “1” Input Latch Clock P3.12/BHE P3.15/CLKOUT Output Buffer x = 15, 12 Alternate Function Enable |
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