SM8521 datasheet(8/56 Pages) SHARP

8 / 56 page

- 8 -

SM8521

SM85CPU

The SM85CPU is an 8-bit CPU with an unique

architecture, developed by SHARP, and the

following features.

General purpose register architectures

• There are eight 8-bit general purpose registers

(also serve as four 16-bit general purpose

registers) and four 16-bit general purpose

registers serve as accumulator, index register, or

the pointer registers.

General purpose register allocated at RAM

• The general purpose registers access the RAM

location by the register pointer RP. So pushing

the register during an interrupt and passing

parameter to subroutine can be executed in High

speed.

Refined instruction set

• The instruction set contains total 67 members : 8

load instructions, 19 arithmetic instructions, 7 logic

instructions, 9 program control (branch) instruction,

8 bit manipulation instructions, 8 rotate & shift

instructions and 9 CPU control instructions.

• There are powerful bit manipulation instructions

includes plural bits transfer, logical operation

between bits, and the bit test and jump instructions

that incorporates a test and condition branch in the

same instruction. (Refer to Table 1)

• There are data transfer, arithmetic and conditional

branch instructions for 16-bit. It can rapidly

process the word-sized and long jump.

• There are 8-bit x 8-bit

→16-bit multiplication and

16-bit x 16-bit

→16-bit remaining 8-bit division

instructions. (Unsigned arithmetic)

23 address modes

• The rich address modes provides optimal access

to ROM, RAM and the register files.

Illegal instruction detecting function

• When an error code is detected, a non-maskable

interrupt (NMI) will be generated.

Standby function

• There are two standby modes, HALT and STOP

mode, and the mode can be changed by HALT

instruction or STOP instruction respectively.

Table 1

Instruction summary

TYPE

INSTRUCTION

NUMBER

Load instruction

CLR, MOV, MOVM, MOVW, POP, POPW, PUSH, PUSHW

Arithmetic instruction

ADC, ADCW, ADD, ADDW, CMP, CMPW, DA, DEC, DECW, DIV,

EXTS, INC, INCW, MULT, NEG, SBC, SBCW, SUB, SUBW

Logic instruction

AND, ANDW, COM, OR, ORW, XOR, XORW

Program control instruction

BBC, BBS, BR, CALL, CALS, DBNZ, IRET, JMP, RET

Bit manipulation instruction

BAND, BCLR, BCMP, BMOV, BOR, BTST, BSET, BXOR

Rotate & shift instruction

RL, RLC, RR, RRC, SLL, SRA, SRL, SWAP

CPU control instruction

COMC, CLRC, DI, EI, HALT, NOP, SETC, STOP

Total 67

SM8521 Datasheet(PDF) 8 Page - Sharp Corporation

SM8521 Datasheet(HTML) 8 Page - Sharp Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

Datasheet Download

Link URL