About: ST6 and ST7

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The ST6 and ST7 are 8-bit microcontroller product lines from STMicroelectronics. They are commonly used in small embedded applications like washing machines. Although they use similar peripherals and are marketed as part of the same product line, the two architectures are actually quite different. Both have an 8-bit accumulator used for most operations, plus two 8-bit index registers (X and Y) used for memory addressing. Also both have 8-bit instructions followed by up to 2 bytes of operands, and both have support for manipulating and branching on individual bits of memory.

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  • ST6 y ST7 son líneas de productos de microcontroladores de 8 bits de STMicroelectronics . Se utilizan comúnmente en pequeñas aplicaciones integradas como electrodomésticos, aplicaciones comerciales e industriales de pequeña escala. Aunque utilizan periféricos similares y se comercializan como parte de la misma línea de productos, ​ ​ las dos arquitecturas son bastante diferentes. Ambos tienen un acumulador de 8 bits que se usa para la mayoría de las operaciones, además de dos registros de índice de 8 bits (X e Y) que se usan para el direccionamiento de la memoria. Además, ambos tienen instrucciones de 8 bits seguidas de hasta 2 bytes de operandos, y ambos admiten la manipulación y bifurcación de bits de memoria individuales. aquí acaban las similitudes. El ST6 es una arquitectura Harvard con un espacio de direcciones de datos de 8 bits (256 bytes) y un espacio de programa separado de 12 bits (4096 bytes). Los operandos siempre tienen 1 byte de longitud y algunas instrucciones admiten dos operandos, como "mover 8 bits inmediatos a una dirección de memoria de 8 bits". Las llamadas a subrutinas se realizan utilizando una pila de hardware independiente. Los registros de datos (pero no el contador de programa o las banderas) están mapeados en memoria. Los modos de direccionamiento del ST6 se limitan a la dirección de memoria absoluta inmediata de 8 bits y los modos indirectos de registro (X) e (Y). El ST7 es una arquitectura de von Neumann con un solo espacio de direcciones de 16 bits (64 kiB). Los primeros 256 bytes de RAM (la página cero ) tienen flexibilidad adicional. No hay instrucciones de dos operandos, excepto "bit de prueba y bifurcación". Sus registros no están mapeados en memoria y utiliza RAM de uso general (más un registro de puntero de pila ) para llamadas a subrutinas. El ST7 admite una amplia variedad de modos de direccionamiento, incluidos base+índice y doble indirecto. (es)
  • The ST6 and ST7 are 8-bit microcontroller product lines from STMicroelectronics. They are commonly used in small embedded applications like washing machines. Although they use similar peripherals and are marketed as part of the same product line, the two architectures are actually quite different. Both have an 8-bit accumulator used for most operations, plus two 8-bit index registers (X and Y) used for memory addressing. Also both have 8-bit instructions followed by up to 2 bytes of operands, and both have support for manipulating and branching on individual bits of memory. There, the similarities end. The ST6 is a Harvard architecture with an 8-bit (256 byte) data address space and a separate 12-bit (4096 byte) program space. Operands are always 1 byte long, and some instructions support two operands, such as "move 8-bit immediate to 8-bit memory address". Subroutine calls are done using a separate hardware stack. Data registers (but not the program counter or flags) are memory-mapped. The ST6's addressing modes are limited to immediate, 8-bit absolute memory address, and register indirect modes (X) and (Y). The ST7 is a von Neumann architecture with a single 16-bit (64 kiB) address space. The first 256 bytes of RAM (the zero page) have extra flexibility. There are no two-operand instructions except for "test bit and branch". Its registers are not memory-mapped, and it uses general-purpose RAM (plus a stack pointer register) for subroutine calls. The ST7 supports a wide variety of addressing modes, including base+index and double-indirect. (en)
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  • ST6 y ST7 son líneas de productos de microcontroladores de 8 bits de STMicroelectronics . Se utilizan comúnmente en pequeñas aplicaciones integradas como electrodomésticos, aplicaciones comerciales e industriales de pequeña escala. Aunque utilizan periféricos similares y se comercializan como parte de la misma línea de productos, ​ ​ las dos arquitecturas son bastante diferentes. aquí acaban las similitudes. Los modos de direccionamiento del ST6 se limitan a la dirección de memoria absoluta inmediata de 8 bits y los modos indirectos de registro (X) e (Y). (es)
  • The ST6 and ST7 are 8-bit microcontroller product lines from STMicroelectronics. They are commonly used in small embedded applications like washing machines. Although they use similar peripherals and are marketed as part of the same product line, the two architectures are actually quite different. Both have an 8-bit accumulator used for most operations, plus two 8-bit index registers (X and Y) used for memory addressing. Also both have 8-bit instructions followed by up to 2 bytes of operands, and both have support for manipulating and branching on individual bits of memory. (en)
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  • ST6 y ST7 (es)
  • ST6 and ST7 (en)
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