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ST10F296 数据表(PDF) 143 Page - STMicroelectronics |
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ST10F296 数据表(HTML) 143 Page - STMicroelectronics |
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143 / 346 page  Obsolete Product(s) - Obsolete Product(s) ST10F296E Parallel ports 143/346 DP4 register Only bits 7 to 0 of the DP4 register are implemented. All other bits are read as 0. ODP4 register Only bits 7 to 4 of the ODP4 register are implemented. All other bits are read as 0. Note: When I2C is enabled by setting the XPEN and XI2CEN bits of the SYSCON and XPERCON registers respectively, pins P4.4 and P4.7 become fully dedicated to the I2C interface. All alternate functions are bypassed (external memory and CAN2 functions). The pins are also automatically configured as open-drain as requested by the I2C bus standard. The Port 4 control registers P4, DP4 , and ODP4 can no longer control pins P4.7 and P4.4, as writing in the bits corresponding to P4.4 and P4.7 of these registers has no effect on pin behavior. DP4 (FFCAh/E5h) SFR Reset value: --00h 15 14 13 12 11 10 987 65432 10 --- ----- DP4 .7 DP4 .6 DP4 .5 DP4 .4 DP4 .3 DP4 .2 DP4 .1 DP4 .0 --- ----- RW RW RW RW RW RW RW RW Table 82. DP4 register description Bit Bit name Function 7-0 DP4.y Port direction register DP4 bit y 0: Port line P4.y is an input (high impedance) 1: Port line P4.y is an output ODP4 (F1CAh/E5h) ESFR Reset value: --00h 15 14 13 12 11 10 987 65432 10 --- ----- OD P4.7 OD P4.6 OD P4.5 OD P4.4 - --- --- ----- RW RW RW RW - - - - Table 83. ODP4 register description Bit Bit name Function 7-4 ODP4.y Port open-drain control register ODP4 bit y 0: Port line P4.y output driver in push-pull mode 1: Port line P4.y output driver in open-drain mode if P4.y is not a segment address line output Obsolete Product(s) - Obsolete Product(s) |
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