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ST92141 数据表(PDF) 79 Page - STMicroelectronics |
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ST92141 数据表(HTML) 79 Page - STMicroelectronics |
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79 / 179 page  79/179 ST92141 - I/O PORTS 6 I/O PORTS 6.1 INTRODUCTION ST9 devices feature flexible individually program- mable multifunctional input/output lines. Refer to the Pin Description Chapter for specific pin alloca- tions. These lines, which are logically grouped as 8-bit ports, can be individually programmed to pro- vide digital input/output and analog input, or to connect input/output signals to the on-chip periph- erals as alternate pin functions. All ports can be in- dividually configured as an input, bi-directional, output or alternate function. In addition, pull-ups can be turned off for open-drain operation, and weak pull-ups can be turned on in their place, to avoid the need for off-chip resistive pull-ups. Ports configured as open drain must never have voltage on the port pin exceeding VDD (refer to the Electri- cal Characteristics section). Depending on the specific port, input buffers are software selectable to be TTL or CMOS compatible, however on Sch- mitt trigger ports, no selection is possible. 6.2 SPECIFIC PORT CONFIGURATIONS Refer to the Pin Description chapter for a list of the specific port styles and reset values. 6.3 PORT CONTROL REGISTERS Each port is associated with a Data register (PxDR) and three Control registers (PxC0, PxC1, PxC2). These define the port configuration and al- low dynamic configuration changes during pro- gram execution. Port Data and Control registers are mapped into the Register File as shown in Fig- ure 41. Port Data and Control registers are treated just like any other general purpose register. There are no special instructions for port manipulation: any instruction that can address a register, can ad- dress the ports. Data can be directly accessed in the port register, without passing through other memory or “accumulator” locations. Figure 41. I/O Register Map GROUP E GROUP F PAGE 2 GROUP F PAGE 3 GROUP F PAGE 43 System Registers FFh Reserved P7DR P9DR R255 FEh P3C2 P7C2 P9C2 R254 FDh P3C1 P7C1 P9C1 R253 FCh P3C0 P7C0 P9C0 R252 FBh Reserved P6DR P8DR R251 FAh P2C2 P6C2 P8C2 R250 F9h P2C1 P6C1 P8C1 R249 F8h P2C0 P6C0 P8C0 R248 F7h Reserved Reserved Reserved R247 F6h P1C2 P5C2 R246 E5h P5DR R229 F5h P1C1 P5C1 R245 E4h P4DR R228 F4h P1C0 P5C0 R244 E3h P3DR R227 F3h Reserved Reserved R243 E2h P2DR R226 F2h P0C2 P4C2 R242 E1h P1DR R225 F1h P0C1 P4C1 R241 E0h P0DR R224 F0h P0C0 P4C0 R240 1 |
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