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ST10F296 数据表(PDF) 131 Page - STMicroelectronics |
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ST10F296 数据表(HTML) 131 Page - STMicroelectronics |
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131 / 346 page  Obsolete Product(s) - Obsolete Product(s) ST10F296E Parallel ports 131/346 DP1L and DP1H registers 13.3.2 Alternate functions of Port 1 When a demultiplexed external bus is enabled, Port 1 is used as an address bus. Note that demultiplexed bus modes use Port 1 as a 16-bit port. Otherwise all 16 port lines can be used for general purpose I/O. The upper four pins of Port 1 (P1H.7 to P1H.4) are also capture input lines for the CAPCOM2 unit (CC27-24 I). The capture input functions of pins P1H.7 to P1H.4 can be used for external interrupt inputs with a sample rate of eight CPU clock cycles. As a side effect, the capture input capability of these lines can also be used in the address bus mode. Changes of the upper address lines may be detected, thereby triggering an interrupt request that performs some special service routines. External capture signals can only be applied if no address output is selected for Port 1. During external access in demultiplexed bus modes, Port 1 outputs the 16-bit intra-segment address as an alternate output function. During external access in multiplexed bus modes, when no BUSCON register selects a de- multiplexed bus mode, Port 1 is not used and is available for general purpose I/O. DP1L (F104h/82h) ESFR Reset value: --00h 15 14 13 12 11 10 9 8 765 43210 Reserved DP1L .7 DP1L .6 DP1L .5 DP1L .4 DP1L .3 DP1L .2 DP1L .1 DP1L .0 - RW RW RW RW RW RW RW RW DP1H (F106h/83h) ESFR Reset value: --00h 15 14 13 12 11 10 9 8 7 654 3210 Reserved DP1H .7 DP1H .6 DP1H .5 DP1H .4 DP1H .3 DP1H .2 DP1H .1 DP1H .0 - RW RW RW RW RW RW RW RW Table 70. DP1L and DP1H register description Bit Bit name Function 15-8 - Reserved 7-0 DP1X.y Port direction register DP1L or DP1H bit y 0: Port line P1X.y is an input (high impedance) 1: Port line P1X.y is an output Obsolete Product(s) - Obsolete Product(s) |
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