Epson CMOS 32-Bit Single Chip Microcomputer S1C33L03 Manual de usuario descargar pdf (Pagina 19)

2 REGISTERS

S1C33 FAMILY C33 PE CORE MANUAL

EPSON

2.9 Register Notation and Register Numbers

The following describes the register notation and register numbers in the C33 PE Core instruction set.

In the instruction code, a register is specified using a 4-bit field, with the register number entered in that field. In the

mnemonic, a register is specified by prefixing the register name with “

%.”

2.9.1 General-Purpose Registers

%rs rs is a metasymbol indicating the general-purpose register that holds the source data to be operated on or

transferred. The register is actually written as

%r0, %r1, ... or %r15.

%rd rd is a metasymbol indicating the general-purpose register that is the destination in which the result of

operation is to be stored or data is to be loaded. The register is actually written as

%r0, %r1, ... or %r15.

%rb rb is a metasymbol indicating the general-purpose register that holds the base address of memory to be

accessed. In this case, the general-purpose registers serve as an index register. The register is actually

written as

[%r0], [%r1], ... or [%r15], with each register name enclosed in brackets “[]” to denote

continuous memory addresses can be used. In such a case, the register name is suffixed by “

+,” as in [%r0]+.

When post-increment is specified, each time memory is accessed, the base address is incremented by an

amount equal to the accessed size.

rb is also used as a symbol indicating the register that contains the jump address for the call or jp

instruction. In this case, the brackets “

[]” are unnecessary, and the register is written as %r0, %r1, ... or

%r15.

The bit field that specifies a register in the instruction code contains the code corresponding to a given register

number. The relationship between the general-purpose registers and the register numbers is listed in the table below.

Table 2.9.1.1 General-Purpose Registers

General-purpose register

R10

R11

R12

R13

R14

R15

%r0

%r1

%r2

%r3

%r4

%r5

%r6

%r7

%r8

%r9

%r10

%r11

%r12

%r13

%r14

%r15

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 180 181

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