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PSD4235G2 データシート(PDF) 55 Page - STMicroelectronics |
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PSD4235G2 データシート(HTML) 55 Page - STMicroelectronics |
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55 / 89 page  55/89 PSD4235G2 Table 46. Drive Register Pin Assignment Note: 1. NA = Not Applicable. Table 47. Port Data Registers Port Data Registers. The Port Data Registers, shown in Table 47, are used by the MCU to write data to or read data from the ports. Table 47 shows the register name, the ports having each register type, and MCU access for each register type. The registers are described next. Data In. Port pins are connected directly to the Data In buffer. In MCU I/O Input mode, the pin in- put is read through the Data In buffer. Data Out Register. Stores output data written by the MCU in the MCU I/O Output mode. The con- tents of the Register are driven out to the pins if the Direction Register or the output enable product term is set to 1. The contents of the register can also be read back by the MCU. Output Macrocells (OMC). The CPLD Output Macrocells (OMC) occupy a location in the MCU’s address space. The MCU can read the output of the Output Macrocells (OMC). If the Mask Macro- cell Register bits are not set, writing to the Macro- cell loads data to the Macrocell flip-flops. See the section entitled “Macrocell and I/O Port”, on page 34. Mask Macrocell Register. Each Mask Macrocell Register bit corresponds to an Output Macrocell (OMC) flip-flop. When the Mask Macrocell Regis- ter bit is set to a 1, loading data into the Output Macrocell (OMC) flip-flop is blocked. The default value is 0, or unblocked. Input Macrocells (IMC). The Input Macrocells (IMC) can be used to latch or store external inputs. The outputs of the Input Macrocells (IMC) are rout- ed to the PLD input bus, and can be read by the MCU. See the section entitled “Input Macrocells (IMC)”, on page 37. Drive Register Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Port A Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Port B Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Port C Slew Rate Slew Rate Slew Rate Slew Rate Slew Rate Slew Rate Slew Rate Slew Rate Port D NA1 NA1 NA1 NA1 Open Drain Open Drain Open Drain Open Drain Port E Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Port F Slew Rate Slew Rate Slew Rate Slew Rate Slew Rate Slew Rate Slew Rate Slew Rate Port G Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Open Drain Register Name Port MCU Access Data In A, B, C, D, E, F, G Read – input on pin Data Out A, B, C, D, E, F, G Write/Read Output Macrocell A, B Read – outputs of Macrocells Write – loading Macrocells Flip-flop Mask Macrocell A, B Write/Read – prevents loading into a given Macrocell Input Macrocell A, B, C Read – outputs of the Input Macrocells Enable Out A, B, C, F Read – the output enable control of the port driver |
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