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ST10F280 数据表(PDF) 99 Page - STMicroelectronics |
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ST10F280 数据表(HTML) 99 Page - STMicroelectronics |
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99 / 186 page  ST10F280 99/186 12.10 - Port 8 If this 8-bit port is used for general purpose I/O, the direction of each line can be configured via the corre- sponding direction register DP8. Each port line can be switched into push/pull or open drain mode via the open drain control register ODP8. P8 (FFD4h / EAh) SFR Reset Value: - - 00h DP8 (FFD6h / EBh) SFR Reset Value: - - 00h ODP8 (F1D6h / EBh) ESFR Reset Value: - - 00h 12.10.1 - Alternate Functions of Port 8 The 8 lines of Port 8 (P8.7...P8.0) serve as capture inputs or compare outputs (CC23IO...CC16IO) for the CAPCOM2 unit. The usage of the port lines by the CAPCOM unit, its accessibility via software and the precautions are the same as described for the Port 2 lines. As all other capture inputs, the capture input function of pins P8.7...P8.0 can also be used as external interrupt inputs (200 ns sample rate at 40MHz CPU clock). The Table 20 summarizes the alternate functions of Port 8. 15 14 13 12 11 10 98 765 432 10 - - - - - - - - P8.7 P8.6 P8.5 P8.4 P8.3 P8.2 P8.1 P8.0 RW RW RW RW RW RW RW RW P8.y Port data register P8 bit y 15 14 13 12 11 10 98 765 432 10 - - - - - - - - DP8.7 DP8.6 DP8.5 DP8.4 DP8.3 DP8.2 DP8.1 DP8.0 RW RW RW RW RW RW RW RW DP8.y Port direction register DP8 bit y DP8.y = 0: Port line P8.y is an input (high impedance) DP8.y = 1: Port line P8.y is an output 15 14 13 12 11 10 9 8 76543210 - ------- ODP8.7 ODP8.6 ODP8.5 ODP8.4 ODP8.3 ODP8.2 ODP8.1 ODP8.0 RW RW RW RW RW RW RW RW ODP8.y Port 8 Open Drain control register bit y ODP8.y = 0: Port line P8.y output driver in push-pull mode ODP8.y = 1: Port line P8.y output driver in open drain mode Table 20 : Port 8 Alternate Functions Port 7 Alternate Function P8.0 P8.1 P8.2 P8.3 P8.4 P8.5 P8.6 P8.7 CC16IO Capture input / compare output channel 16 CC17IO Capture input / compare output channel 17 CC18IO Capture input / compare output channel 18 CC19IO Capture input / compare output channel 19 CC20IO Capture input / compare output channel 20 CC21IO Capture input / compare output channel 21 CC22IO Capture input / compare output channel 22 CC23IO Capture input / compare output channel 23 |
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