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PSD813F1-A-90MI Datasheet(PDF) 11 Page - STMicroelectronics |
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PSD813F1-A-90MI Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 120 page Preliminary PSD813F1-A 7 PSD813F1 Architectural Overview (cont.) 5.4 I/O Ports The PSD813F1 has 27 I/O pins divided among four ports (Port A, B, C, and D). Each I/O pin can be individually configured for different functions. Ports A, B, C and D can be configured as standard MCU I/O ports, PLD I/O, or latched address outputs for microcontrollers using multiplexed address/data busses. The JTAG pins can be enabled on Port C for In-System Programming (ISP). Ports A and B can also be configured as a data port for a non-multiplexed bus or multiplexed Address/Data buses for certain types of 16-bit microcontrollers. 5.5 Microcontroller Bus Interface The PSD813F1 easily interfaces with most 8-bit microcontrollers that have either multiplexed or non-multiplexed address/data busses. The device is configured to respond to the microcontroller’s control signals, which are also used as inputs to the PLDs. Where there is a requirement to use a 16-bit data bus to interface to a 16-bit microcontroller, two PSDs must be used. Section 9.3.5 contains microcontroller interface examples. 5.6 JTAG Port In-System Programming can be performed through the JTAG pins on Port C. This serial interface allows complete programming of the entire PSD813F1 device. A blank device can be completely programmed. The JTAG signals (TMS, TCK, TSTAT, TERR, TDI, TDO) can be multiplexed with other functions on Port C. Table 3 indicates the JTAG signals pin assignments. Port C Pins JTAG Signal PC0 TMS PC1 TCK PC3 TSTAT PC4 TERR PC5 TDI PC6 TDO Table 3. JTAG Signals on Port C |
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