Rev. 2.0, 11/00, page 43 of 1037
2.6.4
Basic Instruction Formats
The CPU instructions consist of 2-byte (1-word) units. An instruction consists of an operation
field (op field), a register field (r field), an effective address extension (EA field), and a
condition field (cc).
Figure 2.12 shows examples of instruction formats.
op
op
r n
r m
NOP, RTS, etc.
ADD.B Rn, Rm, etc.
MOV.B@(d:16, Rn), Rm, etc.
(1) Operation field only
(2) Operation field and register fields
(3) Operation field, register fields, and effective address extension
r n
r m
op
EA (disp)
(4) Operation field, effective address extension, and condition field
op
cc
EA (disp)
BRA d:16, etc.
Figure 2.12 Instruction Formats (Examples)
(1) Operation Field
Indicates the function of the instruction, the addressing mode, and the operation to be carried
out on the operand. The operation field always includes the first four bits of the instruction.
Some instructions have two operation fields.
(2) Register Field
Specifies a general register. Address registers are specified by 3 bits, data registers by 3 bits
or 4 bits. Some instructions have two register fields. Some have no register field.
(3) Effective Address Extension
Eight, 16, or 32 bits specifying immediate data, an absolute address, or a displacement.
(4) Condition Field
Specifies the branching condition of Bcc instructions.
Содержание Hitachi H8S/2191
Страница 123: ...Rev 2 0 11 00 page 96 of 1037...
Страница 149: ...Rev 2 0 11 00 page 122 of 1037...
Страница 197: ...Rev 2 0 11 00 page 170 of 1037...
Страница 247: ...Rev 2 0 11 00 page 220 of 1037...
Страница 249: ...Rev 2 0 11 00 page 222 of 1037...
Страница 347: ...Rev 2 0 11 00 page 320 of 1037...
Страница 357: ...Rev 2 0 11 00 page 330 of 1037...
Страница 417: ...Rev 2 0 11 00 page 390 of 1037...
Страница 431: ...Rev 2 0 11 00 page 404 of 1037...
Страница 439: ...Rev 2 0 11 00 page 412 of 1037...
Страница 457: ...Rev 2 0 11 00 page 430 of 1037...
Страница 525: ...Rev 2 0 11 00 page 498 of 1037...
Страница 543: ...Rev 2 0 11 00 page 516 of 1037...
Страница 639: ...Rev 2 0 11 00 page 612 of 1037 28 1 2 Block Diagram Figure 28 1 shows a block diagram of the servo circuits...
Страница 845: ...Rev 2 0 11 00 page 818 of 1037...