SX Embedded Controller Registers

Data Memory / File Registers

The data memory is a RAM-based register set consisting of general-purpose registers and dedicated-purpose registers. The number of registers depends on the SX device type. The SX18/20/28AC and SX18/20/28AC75 devices have 136 general-purpose registers and eight dedicated-purpose registers. The SX48/52BD has 262 general-purpose registers and ten dedicated-purpose registers. All of these registers are eight bits wide. The registers are organized into banks, allowing the SX instructions to address the registers using just five bits of the 12-bit instruction opcode.

Because the registers are organized into banks or “files,” these memory-mapped registers are called “file registers.” In the descriptions of the SX instructions in Chapter 3, the abbreviation “fr” represents a 5-bit register selection value encoded into the instruction opcode.

See:

• SX18/20/28AC and SX18/20/28AC75 Addressing Modes and FSR Register
• SX48/52BD Addressing Modes and FSR Register

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